50278 + Interview Questions in Physics Page 257 InterviewSolution

12801.	Two wires with currents 2 A and I A are enclosed in a circular loop. Another wire with current 3 A is situated outside the loop as shown.The ∮→B.d→l around the loop is [1 Mark]
Answer» Two wires with currents $2 A$ and $I A$ are enclosed in a circular loop. Another wire with current $3 A$ is situated outside the loop as shown. The $\oint \to B . d \to l$ around the loop is $[$ 1 Mark $]$

Discussion

12802.	Find the net force per unit length on z.
Answer» Find the net force per unit length on z.

Discussion

12803.	Figure (8-E4) shows a particle sliding on a frictionless.; track which terminates in a straight horizontal section.. If the particle starts slipping from the point A, how far away from the track will the particle hit the ground ?
Answer» Figure (8-E4) shows a particle sliding on a frictionless.; track which terminates in a straight horizontal section.. If the particle starts slipping from the point A, how far away from the track will the particle hit the ground ?

12803.

Figure (8-E4) shows a particle sliding on a frictionless.; track which terminates in a straight horizontal section.. If the particle starts slipping from the point A, how far away from the track will the particle hit the ground ?

Answer»

Figure (8-E4) shows a particle sliding on a frictionless.; track which terminates in a straight horizontal section.. If the particle starts slipping from the point A, how far away from the track will the particle hit the ground ?

Discussion

12804.	Two photons having
Answer» Two photons having

Discussion

12805.	A particle of mass M starting from rest undergoes uniform acceleration.If the speed acquired in time T is V,the power delivered to the particle is
Answer» A particle of mass M starting from rest undergoes uniform acceleration.If the speed acquired in time T is V,the power delivered to the particle is

Discussion

12806.	As shown in figure, light is incident normally on one face of the prism. A liquid of refractive index μ is placed on the horizontal face AC. The refractive index of prism is 3/2. If total internal reflection taken place on face AC, μ should be less than l√34, where l is an integer. Find the value of l.
Answer» As shown in figure, light is incident normally on one face of the prism. A liquid of refractive index $μ$ is placed on the horizontal face $AC$ . The refractive index of prism is $3 / 2$ . If total internal reflection taken place on face $AC$ , $μ$ should be less than $\frac{l \sqrt{3}}{4},$ where $l$ is an integer. Find the value of $l$ .

Discussion

12807.	What do you understand by the term "electronic configuration" of an element? Write down the electronic configuration of oxygen(At. No.=8).
Answer» What do you understand by the term "electronic configuration" of an element? Write down the electronic configuration of oxygen(At. No.=8).

Discussion

12808.	Give the derivation for the expression of centripetal acceleration.
Answer» Give the derivation for the expression of centripetal acceleration.

Discussion

12809.

The electric field E is measured at a point P(0,0,d) generated due to various charge distributions and the dependence of E on d is found to be different for different charge distributions.Column-II describes different electric charge distributions, along with their locations. Match the functions in column-I with the related charge distributions in column-II.column -I column-II(A) E is independent of d (P) A point charge Q at the origin(B) E∝1d (Q) A small dipole with point charges Q at (0,0,l) and −Q at (0,0,−l). Take 2l<<<d.(C) E∝1d2 (R) An infinite line charge coincident with the x- axis, with uniform linear charge density λ (D) E∝1d3 (S) Two infinite wire carrying uniform linear charge density parallel to the x-axis. The one along (y=0,z=l) has a charge density λ and the another along (y=0,z=−l) has a charge density −λ. Take 2l<<d. (T) Infinite plane charge coincident with the xy-plane with uniform surface charge density.Which of the following option has the correct combiantion considering coulumn-I and column-II.

Answer»

The electric field $E$ is measured at a point $P (0, 0, d)$ generated due to various charge distributions and the dependence of $E$ on $d$ is found to be different for different charge distributions.

Column-II describes different electric charge distributions, along with their locations. Match the functions in column-I with the related charge distributions in column-II.

column -I	column-II
(A) $E$ is independent of $d$	(P) A point charge $Q$ at the origin
(B) $E \propto \frac{1}{d}$	(Q) A small dipole with point charges $Q$ at $(0, 0, l)$ and $- Q$ at $(0, 0, - l)$ . Take $2 l <<< d$ .
(C) $E \propto \frac{1}{d^{2}}$	(R) An infinite line charge coincident with the x- axis, with uniform linear charge density $λ$
(D) $E \propto \frac{1}{d^{3}}$	(S) Two infinite wire carrying uniform linear charge density parallel to the x-axis. The one along $(y = 0, z = l)$ has a charge density $λ$ and the another along $(y = 0, z = - l)$ has a charge density $- λ$ . Take $2 l << d$ .
	(T) Infinite plane charge coincident with the xy-plane with uniform surface charge density.

Which of the following option has the correct combiantion considering coulumn-I and column-II.

Discussion

12810.	Visible light of wavelength 550 nm falls on a single slit and produced its second diffraction minimum at an angle of 45∘ relative to the incident direction of the light. What is the width of the slit (in μm)?
Answer» Visible light of wavelength $550 nm$ falls on a single slit and produced its second diffraction minimum at an angle of $45^{\circ}$ relative to the incident direction of the light. What is the width of the slit $(in μ m)$ ?

Discussion

12811.	When the current changes from 2A to -2A in 0.05 second an end of 8 V is induced in a coil . The coefficient of self inductance of coil is
Answer» When the current changes from 2A to -2A in 0.05 second an end of 8 V is induced in a coil . The coefficient of self inductance of coil is

Discussion

12812.	A point charge q is placed at a normal distance dfrom one edge of a semi-infinite large plate asshown in figure. Find net electric flux passingthrough this plateSemi infiniteplaten.
Answer» A point charge q is placed at a normal distance dfrom one edge of a semi-infinite large plate asshown in figure. Find net electric flux passingthrough this plateSemi infiniteplaten.

Discussion

12813.	56. The rate of a reaction becomes 2 times for every 10 degree centigrade rise in temperature how many times rate of reaction will be increased when temperature is increased from 10 degree centigrade to 80 degree centigrade
Answer» 56. The rate of a reaction becomes 2 times for every 10 degree centigrade rise in temperature how many times rate of reaction will be increased when temperature is increased from 10 degree centigrade to 80 degree centigrade

Discussion

12814.	The neutron separation energy is defined as the energy required toremove a neutron from the nucleus. Obtain the neutron separationenergies of the nuclei 4120Ca and 2713Al from the following data:m(4020Ca ) = 39.962591 um(4120Ca ) = 40.962278 um(2613Al ) = 25.986895 um(2713Al ) = 26.981541 u
Answer» The neutron separation energy is defined as the energy required toremove a neutron from the nucleus. Obtain the neutron separationenergies of the nuclei 4120Ca and 2713Al from the following data:m(4020Ca ) = 39.962591 um(4120Ca ) = 40.962278 um(2613Al ) = 25.986895 um(2713Al ) = 26.981541 u

Discussion

12815.	A, B, C, D are four trees, located at the vertices of a square. Wind blows from A to B with uniform speed. The ratio of times of flight of a bird from A to B and from B to A is 'n'. At what angle should the bird fly from the direction of wind flow, in order that it starts from A and reaches C.Let
Answer» A, B, C, D are four trees, located at the vertices of a square. Wind blows from A to B with uniform speed. The ratio of times of flight of a bird from A to B and from B to A is 'n'. At what angle should the bird fly from the direction of wind flow, in order that it starts from A and reaches C.Let

Discussion

12816.	Find the angle of incidence (θ) of a paraxial ray incident on a concave mirror of large aperture, for which it passes through the pole (P) after reflection.
Answer» Find the angle of incidence $(θ)$ of a paraxial ray incident on a concave mirror of large aperture, for which it passes through the pole $(P)$ after reflection.

Discussion

12817.	105.A charged particle is projected in uniform magnetic field at an angle 45 degree with magnetic field. If circumference of the helical path followed by it is 2cm, then pitch of helix is
Answer» 105.A charged particle is projected in uniform magnetic field at an angle 45 degree with magnetic field. If circumference of the helical path followed by it is 2cm, then pitch of helix is

Discussion

12818.	An air column is constructed by fitting a movable piston in a long cylindrical tube. Longitudinal waves are sent in the tube by a tuning fork of frequency 416 Hz. How far from the open end should the piston be so that the air column in the tube may vibrate in its first overtone neglecting the end corrections? [ speed of sound in air =333 m/s ]
Answer» An air column is constructed by fitting a movable piston in a long cylindrical tube. Longitudinal waves are sent in the tube by a tuning fork of frequency $416 Hz$ . How far from the open end should the piston be so that the air column in the tube may vibrate in its first overtone neglecting the end corrections? $[$ speed of sound in air $= 333 m/s]$

Discussion

12819.	A small filament is at centre of a hollow glass sphere of inner and outer radii 8cm and 9 cm respectively. The refractive index of glass is 1.5 calculate the position of the image of the filament when viewed from outside of the sphere. And also draw the ray diagram
Answer» A small filament is at centre of a hollow glass sphere of inner and outer radii 8cm and 9 cm respectively. The refractive index of glass is 1.5 calculate the position of the image of the filament when viewed from outside of the sphere. And also draw the ray diagram

Discussion

12820.	Total number of voids per unit cell if a metal cristalises into hcp is
Answer» Total number of voids per unit cell if a metal cristalises into hcp is

Discussion

12821.	A point like object is placed at a distance of 1 m in front of a convex lens of focal length 0.5 m. A plane mirror is placed at a distance of 2 m behind the lens. The position and nature of the final image formed by the system is :
Answer» A point like object is placed at a distance of $1 m$ in front of a convex lens of focal length $0.5 m .$ A plane mirror is placed at a distance of $2 m$ behind the lens. The position and nature of the final image formed by the system is :

Discussion

12822.	how to find electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A?
Answer» how to find electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A?

Discussion

12823.	The Electric Field between the capacitor plates is a constant 5N/C. If the region between the plates has vacuum, what is the energy density for the capacitor?
Answer» The Electric Field between the capacitor plates is a constant 5N/C. If the region between the plates has vacuum, what is the energy density for the capacitor?

Discussion

12824.	A material P of thickness 1 mm is sandwiched between two steel slabs, as shown in the figure below. A heat flux 10 kW/m2 is supplied to one of the steel slabs as shown. The boundary temperatures of the slabs are indicated in the figure. Assume thermal conductivity of this steel as 10 W/mK. Considering one-dimensional steady state heat conduction for the configuration, the thermal conductivity k (in W/mK) of material P is
Answer» A material $P$ of thickness $1 mm$ is sandwiched between two steel slabs, as shown in the figure below. A heat flux $10 {kW/m}^{2}$ is supplied to one of the steel slabs as shown. The boundary temperatures of the slabs are indicated in the figure. Assume thermal conductivity of this steel as $10 W/mK$ . Considering one-dimensional steady state heat conduction for the configuration, the thermal conductivity $k (in W/mK)$ of material $P$ is

Discussion

12825.	34. A particle moving along x-axis has acceleration f, at time t, given f=f nod(1-t/T), where f nod and T are constants. The particle at t=0 has zero velocity. When f=0, the particle's velocity (v) is ?
Answer» 34. A particle moving along x-axis has acceleration f, at time t, given f=f nod(1-t/T), where f nod and T are constants. The particle at t=0 has zero velocity. When f=0, the particle's velocity (v) is ?

Discussion

12826.	Find the ratio of de-Broglie wavelength of an α−particle to that of a proton. The proton is subjected to double the strength of magnetic field that of α−particle so that the radii of their path are equal to each other. Assume the field induction →B perpendicular to velocity vector of the α−particle.
Answer» Find the ratio of de-Broglie wavelength of an $α -$ particle to that of a proton. The proton is subjected to double the strength of magnetic field that of $α -$ particle so that the radii of their path are equal to each other. Assume the field induction $\to B$ perpendicular to velocity vector of the $α -$ particle.

Discussion

12827.	A man is travelling by a car at 40 km/h. After every 80 km, he takes a break for 20 min. How long does he take to cover a distance of 240 km?
Answer» A man is travelling by a car at $40 km/h$ . After every $80 km$ , he takes a break for $20 min$ . How long does he take to cover a distance of $240 km$ ?

Discussion

12828.	71.A force f=10+2x acts on a particle moving in straight line on x axis. The work done by this force during a displacement from x=0 tox=3m is
Answer» 71.A force f=10+2x acts on a particle moving in straight line on x axis. The work done by this force during a displacement from x=0 tox=3m is

Discussion

12829.	Comprehension :A 100 Ω resistance is connected in series with a 4 H inductor. The voltage across the resistor is, VR=2.0sin(103t) V.(iii) Find amplitude of the voltage across the inductor.
Answer» Comprehension : A $100 Ω$ resistance is connected in series with a $4 H$ inductor. The voltage across the resistor is, $V_{R} = 2.0 sin (10^{3} t) V .$ $(i i i)$ Find amplitude of the voltage across the inductor.

Discussion

12830.	50.A student perform an experiment of measuring the thickness of a slab with a vernier callipers whose 50 division of the vernier scale are equal to 49 division of main scale. He noted that zero of the vernier scale is between 7cm and 7.05cm mark of the main scale and 23rd division of the vernier scale exactly coincides with the main scale. What is the measured value of the thickness of the given slab using the vernier callipers ?
Answer» 50.A student perform an experiment of measuring the thickness of a slab with a vernier callipers whose 50 division of the vernier scale are equal to 49 division of main scale. He noted that zero of the vernier scale is between 7cm and 7.05cm mark of the main scale and 23rd division of the vernier scale exactly coincides with the main scale. What is the measured value of the thickness of the given slab using the vernier callipers ?

Discussion

12831.	A sound signal is simultaneously sent in air and water from a boat on a river. The echo of sound returned by the river bed is heard is 4 s, while the echo returned by the aeroplane is heard in 8 s. Find the distance between the aeroplane and the river bed. [velocity of sound in air = 350 m/s, velocity of sound in water = 1500 m/s]
Answer» A sound signal is simultaneously sent in air and water from a boat on a river. The echo of sound returned by the river bed is heard is $4 s$ , while the echo returned by the aeroplane is heard in $8 s$ . Find the distance between the aeroplane and the river bed. [velocity of sound in air = $350 m/s$ , velocity of sound in water = $1500 m/s$ ]

Discussion

12832.	Suppose an earth satellite, revolving in a circular orbit experiences a resistance due to cosmic dust. Then incorrect statement is :-(1)Its kinetic energy will increase(2)Its potential energy will decrease(3)It will spiral towards the earth and in the process its angular momentum will remain conserved(4)It will burn off ultimately
Answer» Suppose an earth satellite, revolving in a circular orbit experiences a resistance due to cosmic dust. Then incorrect statement is :- (1) Its kinetic energy will increase (2) Its potential energy will decrease (3) It will spiral towards the earth and in the process its angular momentum will remain conserved (4) It will burn off ultimately

Discussion

12833.	Lime(d) the respeCtive13 A particle is dropped under gravity from rest from a heighh (g 9.8 ms and it travels a distance 9h /25 in the lastsecond, the height h is(a) 100 m(d) 167.5m(c) 145 m(b) 122.5 m
Answer» Lime(d) the respeCtive13 A particle is dropped under gravity from rest from a heighh (g 9.8 ms and it travels a distance 9h /25 in the lastsecond, the height h is(a) 100 m(d) 167.5m(c) 145 m(b) 122.5 m

Discussion

12834.	Two small bids each of mass m is attached to smooth ring of mass m as shown in the figure. The whole system is kept on smooth horizontal table. Initially each bid has given velocity v0 as shown in figure. Now if velocity of bid just before impact √xv03. Find x. ___
Answer» Two small bids each of mass m is attached to smooth ring of mass m as shown in the figure. The whole system is kept on smooth horizontal table. Initially each bid has given velocity $v_{0}$ as shown in figure. Now if velocity of bid just before impact $\frac{\sqrt{x} v_{0}}{3}$ . Find x. ___

Discussion

12835.	The focal lengths of a converging lens for red, yellow and violet light are 100 cm, 98 cm and 96 cm respectively. Find the approximate dispersive power of the material of the lens.
Answer» The focal lengths of a converging lens for red, yellow and violet light are 100 cm, 98 cm and 96 cm respectively. Find the approximate dispersive power of the material of the lens.

Discussion

12836.	A refile bullet loses 1/20th of its velocity in passing a plank .The least no. of such planks required to just stop the bullet is?
Answer» A refile bullet loses 1/20th of its velocity in passing a plank .The least no. of such planks required to just stop the bullet is?

Discussion

12837.	Obtain the maximum kinetic energy of β-particles, and the radiationfrequencies of γ decays in the decay scheme shown in Fig. 13.6. Youare given thatm(198Au) = 197.968233 um(198Hg) =197.966760 u
Answer» Obtain the maximum kinetic energy of β-particles, and the radiationfrequencies of γ decays in the decay scheme shown in Fig. 13.6. Youare given thatm(198Au) = 197.968233 um(198Hg) =197.966760 u

Discussion

12838.	what is a photon? explain the dual nature of a photon
Answer» what is a photon? explain the dual nature of a photon

Discussion

12839.	3.A block of 3kg rests in limiting equilibrium on an inclined plane of inclination 30degrees. If the inclination of the plane is increased to 60degree ,the minimum force along the plane required to keep it stationary
Answer» 3.A block of 3kg rests in limiting equilibrium on an inclined plane of inclination 30degrees. If the inclination of the plane is increased to 60degree ,the minimum force along the plane required to keep it stationary

Discussion

12840.	The root mean square speed of gas molecules
Answer» The root mean square speed of gas molecules

Discussion

12841.	35.A bus appear to move northward at a speed of 20\sqrt{}3 km per hour to a man driving his car eastwards with speed 20 km per hour .find the velocity of bus with respect to ground (with angle).
Answer» 35.A bus appear to move northward at a speed of 20\sqrt{}3 km per hour to a man driving his car eastwards with speed 20 km per hour .find the velocity of bus with respect to ground (with angle).

Discussion

12842.	For the given charge distribution, net electric field at the centre of non-conducting ring is (in N/C)(Assume that charge on first quadrant is neutral, second and third quadrant is positively charged, fourth quadrant is negatively charged )
Answer» For the given charge distribution, net electric field at the centre of non-conducting ring is (in $N/C$ ) (Assume that charge on first quadrant is neutral, second and third quadrant is positively charged, fourth quadrant is negatively charged )

Discussion

12843.	Find the normal reaction at the contact points of sphere with walls.Consider N1 and N2 to be the normal reactions by first and second wall respectively. [ Take g=10 m/s2 ]
Answer» Find the normal reaction at the contact points of sphere with walls. Consider $N_{1}$ and $N_{2}$ to be the normal reactions by first and second wall respectively. [ Take $g = 10 {m/s}^{2}$ ]

Discussion

12844.	A rectangular lamina of mass 20 kg having sides 6 m and 3 m is placed on the horizontal surface. Find moment of inertia of the lamina about the axis passing through the center and perpendicular to its plane.
Answer» A rectangular lamina of mass $20 kg$ having sides $6 m$ and $3 m$ is placed on the horizontal surface. Find moment of inertia of the lamina about the axis passing through the center and perpendicular to its plane.

Discussion

12845.	A solid cylinder rolls down an inclined plane of inclination 30^°, the acceleration of cylinder is
Answer» A solid cylinder rolls down an inclined plane of inclination 30^°, the acceleration of cylinder is

Discussion

12846.	cosA-sinB/sinAsinB=(cotA-tanB)cotB
Answer» cosA-sinB/sinAsinB=(cotA-tanB)cotB

Discussion

12847.	A spherical conductor of radiius R charged with Q units of charge. The escape velocity of a particleof charge -q and mass m from surface ofconductor is
Answer» A spherical conductor of radiius R charged with Q units of charge. The escape velocity of a particleof charge -q and mass m from surface ofconductor is

Discussion

12848.	It is said that if Force acting on an object is zero, so is the acceleration. But, what if Force acting on a body is constant for a time interval? In such a case is acceleration = 0, too?
Answer» It is said that if Force acting on an object is zero, so is the acceleration. But, what if Force acting on a body is constant for a time interval? In such a case is acceleration = 0, too?

Discussion

12849.	An electron of mass m and charge e is accelerated from rest through a potential difference v in vaccum its final speed will
Answer» An electron of mass m and charge e is accelerated from rest through a potential difference v in vaccum its final speed will

Discussion

12850.	does the value +1/2 and -1/2 have relation to rotaion direction of electron
Answer» does the value +1/2 and -1/2 have relation to rotaion direction of electron

Discussion

Explore topic-wise InterviewSolutions in .

Two wires with currents 2 A and I A are enclosed in a circular loop. Another wire with current 3 A is situated outside the loop as shown.The ∮→B.d→l around the loop is ​​​​​​​[1 Mark]

Find the net force per unit length on z.

Figure (8-E4) shows a particle sliding on a frictionless.; track which terminates in a straight horizontal section.. If the particle starts slipping from the point A, how far away from the track will the particle hit the ground ?

Two photons having

A particle of mass M starting from rest undergoes uniform acceleration.If the speed acquired in time T is V,the power delivered to the particle is

What do you understand by the term "electronic configuration" of an element? Write down the electronic configuration of oxygen(At. No.=8).

Give the derivation for the expression of centripetal acceleration.

Visible light of wavelength 550 nm falls on a single slit and produced its second diffraction minimum at an angle of 45∘ relative to the incident direction of the light. What is the width of the slit (in μm)?

When the current changes from 2A to -2A in 0.05 second an end of 8 V is induced in a coil . The coefficient of self inductance of coil is

A point charge q is placed at a normal distance dfrom one edge of a semi-infinite large plate asshown in figure. Find net electric flux passingthrough this plateSemi infiniteplaten.

56. The rate of a reaction becomes 2 times for every 10 degree centigrade rise in temperature how many times rate of reaction will be increased when temperature is increased from 10 degree centigrade to 80 degree centigrade

The neutron separation energy is defined as the energy required toremove a neutron from the nucleus. Obtain the neutron separationenergies of the nuclei 4120Ca and 2713Al from the following data:m(4020Ca ) = 39.962591 um(4120Ca ) = 40.962278 um(2613Al ) = 25.986895 um(2713Al ) = 26.981541 u

A, B, C, D are four trees, located at the vertices of a square. Wind blows from A to B with uniform speed. The ratio of times of flight of a bird from A to B and from B to A is 'n'. At what angle should the bird fly from the direction of wind flow, in order that it starts from A and reaches C.Let

Find the angle of incidence (θ) of a paraxial ray incident on a concave mirror of large aperture, for which it passes through the pole (P) after reflection.

105.A charged particle is projected in uniform magnetic field at an angle 45 degree with magnetic field. If circumference of the helical path followed by it is 2cm, then pitch of helix is

A small filament is at centre of a hollow glass sphere of inner and outer radii 8cm and 9 cm respectively. The refractive index of glass is 1.5 calculate the position of the image of the filament when viewed from outside of the sphere. And also draw the ray diagram

Total number of voids per unit cell if a metal cristalises into hcp is

A point like object is placed at a distance of 1 m in front of a convex lens of focal length 0.5 m. A plane mirror is placed at a distance of 2 m behind the lens. The position and nature of the final image formed by the system is :

how to find electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A?

The Electric Field between the capacitor plates is a constant 5N/C. If the region between the plates has vacuum, what is the energy density for the capacitor?

34. A particle moving along x-axis has acceleration f, at time t, given f=f nod(1-t/T), where f nod and T are constants. The particle at t=0 has zero velocity. When f=0, the particle's velocity (v) is ?

A man is travelling by a car at 40 km/h. After every 80 km, he takes a break for 20 min. How long does he take to cover a distance of 240 km?

71.A force f=10+2x acts on a particle moving in straight line on x axis. The work done by this force during a displacement from x=0 tox=3m is

Comprehension :A 100 Ω resistance is connected in series with a 4 H inductor. The voltage across the resistor is, VR=2.0sin(103t) V.(iii) Find amplitude of the voltage across the inductor.

Lime(d) the respeCtive13 A particle is dropped under gravity from rest from a heighh (g 9.8 ms and it travels a distance 9h /25 in the lastsecond, the height h is(a) 100 m(d) 167.5m(c) 145 m(b) 122.5 m

Two small bids each of mass m is attached to smooth ring of mass m as shown in the figure. The whole system is kept on smooth horizontal table. Initially each bid has given velocity v0 as shown in figure. Now if velocity of bid just before impact √xv03. Find x. ___

The focal lengths of a converging lens for red, yellow and violet light are 100 cm, 98 cm and 96 cm respectively. Find the approximate dispersive power of the material of the lens.

A refile bullet loses 1/20th of its velocity in passing a plank .The least no. of such planks required to just stop the bullet is?

Obtain the maximum kinetic energy of β-particles, and the radiationfrequencies of γ decays in the decay scheme shown in Fig. 13.6. Youare given thatm(198Au) = 197.968233 um(198Hg) =197.966760 u

what is a photon? explain the dual nature of a photon

3.A block of 3kg rests in limiting equilibrium on an inclined plane of inclination 30degrees. If the inclination of the plane is increased to 60degree ,the minimum force along the plane required to keep it stationary

The root mean square speed of gas molecules

35.A bus appear to move northward at a speed of 20\sqrt{}3 km per hour to a man driving his car eastwards with speed 20 km per hour .find the velocity of bus with respect to ground (with angle).

For the given charge distribution, net electric field at the centre of non-conducting ring is (in N/C)(Assume that charge on first quadrant is neutral, second and third quadrant is positively charged, fourth quadrant is negatively charged )

Find the normal reaction at the contact points of sphere with walls.Consider N1 and N2 to be the normal reactions by first and second wall respectively. [ Take g=10 m/s2 ]

A rectangular lamina of mass 20 kg having sides 6 m and 3 m is placed on the horizontal surface. Find moment of inertia of the lamina about the axis passing through the center and perpendicular to its plane.

A solid cylinder rolls down an inclined plane of inclination 30^°, the acceleration of cylinder is

cosA-sinB/sinAsinB=(cotA-tanB)cotB

A spherical conductor of radiius R charged with Q units of charge. The escape velocity of a particleof charge -q and mass m from surface ofconductor is

It is said that if Force acting on an object is zero, so is the acceleration. But, what if Force acting on a body is constant for a time interval? In such a case is acceleration = 0, too?

An electron of mass m and charge e is accelerated from rest through a potential difference v in vaccum its final speed will

does the value +1/2 and -1/2 have relation to rotaion direction of electron

Two wires with currents 2 A and I A are enclosed in a circular loop. Another wire with current 3 A is situated outside the loop as shown.The ∮→B.d→l around the loop is [1 Mark]