50278 + Interview Questions in Physics Page 194 InterviewSolution

9651.	The radius of gyration of a uniform disc about a line perpendicular to the disc equals its radius. Find the distance of the line from the centre.
Answer» The radius of gyration of a uniform disc about a line perpendicular to the disc equals its radius. Find the distance of the line from the centre.

Discussion

9652.	A uniform disc of radius 5.0 cm and mass 200 g is fixed at its centre to a metal rod, the other end of which is fixed to a celling. The hanging disc is rotated about the rod through an angle and is released. If the disc makes torsional oscillations with time period 0.20 s, find the torsional constant of the rod.
Answer» A uniform disc of radius $5.0 cm$ and mass $200 g$ is fixed at its centre to a metal rod, the other end of which is fixed to a celling. The hanging disc is rotated about the rod through an angle and is released. If the disc makes torsional oscillations with time period $0.20 s$ , find the torsional constant of the rod.

Discussion

9653.	Question 3A circular loop placed in a plane perpendicular to the plane or paper carries a current when the key is ON. The current as seen from points A and B (in the plane of paper and on the axis of the coil) is anticlockwise and clockwise respectively. The magnetic field lines point from B to A. The N-pole or the resultant magnet is on the race close to(a) A(b) B(c) A if the current is small, and B if the current is large(d) B if the current is small and A if the current is large
Answer» Question 3 A circular loop placed in a plane perpendicular to the plane or paper carries a current when the key is ON. The current as seen from points A and B (in the plane of paper and on the axis of the coil) is anticlockwise and clockwise respectively. The magnetic field lines point from B to A. The N-pole or the resultant magnet is on the race close to (a) A (b) B (c) A if the current is small, and B if the current is large (d) B if the current is small and A if the current is large

Discussion

9654.	A 555 timer is configured as an astable mode with RA=4kΩ,RB=4kΩ and C=0.01μF.then the duly cycle of the output wave will be....66.67
Answer» $A 555 t i m e r i s c o n f i g u r e d a s a n a s t a b l e m o d e w i t h R_{A} = 4 k Ω, R_{B} = 4 k Ω a n d C = 0.01 μ F . t h e n t h e d u l y c y c l e o f t h e o u t p u t w a v e w i l l b e . . . .$ 66.67

Discussion

9655.	A particle is projected with horizontal surface with 2/7 m/sec at an angle 60 with horizontal Angular speed of the particle is at the highest point with respect to point of projection is
Answer» A particle is projected with horizontal surface with 2/7 m/sec at an angle 60 with horizontal Angular speed of the particle is at the highest point with respect to point of projection is

Discussion

9656.	A horizontal force F acts on a solid sphere of mass M at its centre. Coefficient of friction between the ground and sphere is μ. Let the maximum force F for which there is no slipping be n2μMg. Find n.
Answer» A horizontal force $F$ acts on a solid sphere of mass $M$ at its centre. Coefficient of friction between the ground and sphere is $μ$ . Let the maximum force $F$ for which there is no slipping be $\frac{n}{2} μ M g$ . Find $n$ .

Discussion

9657.	In a certain process a gas absorbs q amount of heat and performs nq amount of work the molar heat capacity pf the gas in the process is
Answer» In a certain process a gas absorbs q amount of heat and performs nq amount of work the molar heat capacity pf the gas in the process is

Discussion

9658.	A weight lifter lifts 300 kg from the ground to a height of 2 meter in 3 second. The average power generated by him is
Answer» A weight lifter lifts 300 kg from the ground to a height of 2 meter in 3 second. The average power generated by him is

9658.

A weight lifter lifts 300 kg from the ground to a height of 2 meter in 3 second. The average power generated by him is

Answer»

A weight lifter lifts 300 kg from the ground to a height of 2 meter in 3 second. The average power generated by him is

Discussion

9659.	The equivalent inductance of two dissimilar inductors is 2.4 H, when connected in parallel and 10 H, when connected in series. The inductance of one of the inductors is -
Answer» The equivalent inductance of two dissimilar inductors is $2.4 H$ , when connected in parallel and $10 H$ , when connected in series. The inductance of one of the inductors is -

Discussion

9660.	During pure orthogonal turning operation of a hollow clindrical pipe, it is found that the thickness of the chip produced is 0.5mm. The feed given to the zero degree rake angle tool is 0.2mm/rev. The shear strain produced durign the operation is
Answer» During pure orthogonal turning operation of a hollow clindrical pipe, it is found that the thickness of the chip produced is $0.5 m m$ . The feed given to the zero degree rake angle tool is $0.2 m m / r e v$ . The shear strain produced durign the operation is

Discussion

9661.	32.What is the time of flight- 1, when a projectile is projected upward from height 2, When a prjotile is thrown at an angle, from a height downward
Answer» 32.What is the time of flight- 1, when a projectile is projected upward from height 2, When a prjotile is thrown at an angle, from a height downward

Discussion

9662.	For a particle thrown from the ground obliquely u= (5i + 6j) a= (0i - 10j) the horizontal level range of particle is 12m,. 3m.,.6m,. 10m
Answer» For a particle thrown from the ground obliquely u= (5i + 6j) a= (0i - 10j) the horizontal level range of particle is 12m,. 3m.,.6m,. 10m

Discussion

9663.	Three mass of m,m, 2m are placed on the vertices of an equilateral triangle ABC of side l. The force acting on a mass 2m placed at the centroid O of the triangle is?
Answer» Three mass of m,m, 2m are placed on the vertices of an equilateral triangle ABC of side l. The force acting on a mass 2m placed at the centroid O of the triangle is?

Discussion

9664.	(a) Determinethe ‘effective focal length’ of the combination of thetwo lenses in Exercise 9.10, if they are placed 8.0 cm apart withtheir principal axes coincident. Does the answer depend on which sideof the combination a beam of parallel light is incident? Is thenotion of effective focal length of this system useful at all?(b) An object1.5 cm in size is placed on the side of the convex lens in thearrangement (a) above. The distance between the objectand the convex lens is 40 cm. Determine themagnification produced by the two-lens system, and the size of theimage.
Answer» (a) Determine the ‘effective focal length’ of the combination of the two lenses in Exercise 9.10, if they are placed 8.0 cm apart with their principal axes coincident. Does the answer depend on which side of the combination a beam of parallel light is incident? Is the notion of effective focal length of this system useful at all? (b) An object 1.5 cm in size is placed on the side of the convex lens in the arrangement (a) above. The distance between the object and the convex lens is 40 cm. Determine the magnification produced by the two-lens system, and the size of the image.

9664.

(a) Determinethe ‘effective focal length’ of the combination of thetwo lenses in Exercise 9.10, if they are placed 8.0 cm apart withtheir principal axes coincident. Does the answer depend on which sideof the combination a beam of parallel light is incident? Is thenotion of effective focal length of this system useful at all?(b) An object1.5 cm in size is placed on the side of the convex lens in thearrangement (a) above. The distance between the objectand the convex lens is 40 cm. Determine themagnification produced by the two-lens system, and the size of theimage.

Answer»

(a) Determine
the ‘effective focal length’ of the combination of the
two lenses in Exercise 9.10, if they are placed 8.0 cm apart with
their principal axes coincident. Does the answer depend on which side
of the combination a beam of parallel light is incident? Is the
notion of effective focal length of this system useful at all?

(b) An object
1.5 cm in size is placed on the side of the convex lens in the
arrangement (a) above. The distance between the object
and the convex lens is 40 cm. Determine the
magnification produced by the two-lens system, and the size of the
image.

Discussion

9665.	The standard electrode potentials of Zn2+/Zn and Ag+/Ag are -0.763 V and +0.799 V respectively. The standard potential of the cell is [KCET 1993]
Answer» The standard electrode potentials of Zn²⁺/Zn and Ag⁺/Ag are -0.763 V and +0.799 V respectively. The standard potential of the cell is [KCET 1993]

9665.

The standard electrode potentials of Zn2+/Zn and Ag+/Ag are -0.763 V and +0.799 V respectively. The standard potential of the cell is [KCET 1993]

Answer»

The standard electrode potentials of Zn²⁺/Zn and Ag⁺/Ag are -0.763 V and +0.799 V respectively. The standard potential of the cell is

[KCET 1993]

Discussion

9666.	In the figure shown , a coil of single turn is wound on a sphere of radius R and mass m. The plane of the coil is parallel to the plane and lies in the equitorial plane of sphere. Current in the coil is i. Then find the value of B if sphere is in its equilibrium
Answer» In the figure shown , a coil of single turn is wound on a sphere of radius $R$ and mass $m$ . The plane of the coil is parallel to the plane and lies in the equitorial plane of sphere. Current in the coil is $i$ . Then find the value of $B$ if sphere is in its equilibrium

Discussion

9667.	85. Potential of the point B in the circuit below is2 (1)5 V (2)6 V (3)7 V (4)8 V
Answer» 85. Potential of the point B in the circuit below is2 (1)5 V (2)6 V (3)7 V (4)8 V

Discussion

9668.	Calculate the time for which a motor pump of 10HP and effiency 80% must be switched on so, as to pump 50 kg of water through a vertical height of 20m.[g=10m/s2;1HP=758W].
Answer» Calculate the time for which a motor pump of 10HP and effiency 80% must be switched on so, as to pump 50 kg of water through a vertical height of 20m.[g=10m/s2;1HP=758W].

Discussion

9669.

Column I represents the angle at which two mirrors are inclined and column II represents number of images formed in the arrangement. Select the option that correctly matches the number of images formed with the arrangement for an object placed asymmetrical from the mirrors. Column I Column II (a) θ=60∘ (1) n=1 (b) θ=40∘ (2) n=3 (c) θ=90∘ (3) n=5 (d) θ=180∘ (4) n=9

Answer»

Column I represents the angle at which two mirrors are inclined and column II represents number of images formed in the arrangement. Select the option that correctly matches the number of images formed with the arrangement for an object placed asymmetrical from the mirrors.

Column I	Column II
$(a) θ = 60^{\circ}$	$(1) n = 1$
$(b) θ = 40^{\circ}$	$(2) n = 3$
$(c) θ = 90^{\circ}$	$(3) n = 5$
$(d) θ = 180^{\circ}$	$(4) n = 9$

Discussion

9670.	An AIR station is broadcasting the waves of wavelength 300 metres. If the radiating power of the transmitter is 10 kW, then the number of photons radiated per second is
Answer» An AIR station is broadcasting the waves of wavelength 300 metres. If the radiating power of the transmitter is 10 kW, then the number of photons radiated per second is

Discussion

9671.	4: A cell of emf e and internal resistance r is connected across a load resistance R() Find the maximum power delivered at the load?li) Draw the power (P) vs load resistance (R) graph.
Answer» 4: A cell of emf e and internal resistance r is connected across a load resistance R() Find the maximum power delivered at the load?li) Draw the power (P) vs load resistance (R) graph.

Discussion

9672.	Two concentric rings, one of radius ‘a’ and the other of radius ‘b’, have the charges +q, and −(25)−32 respectively, as shown in the figure. Find the ratio ba if a charge particle placed on the axis at z = a is in equilibrium.
Answer» Two concentric rings, one of radius ‘a’ and the other of radius ‘b’, have the charges +q, and $- {(\frac{2}{5})}^{\frac{- 3}{2}}$ respectively, as shown in the figure. Find the ratio $\frac{b}{a}$ if a charge particle placed on the axis at z = a is in equilibrium.

Discussion

9673.	Find the direction of the reaction force on the block for the figure shown.
Answer» Find the direction of the reaction force on the block for the figure shown.

Discussion

9674.	A bulb is marked 220 V, 100 W. What will be the current in the filament, when connected to 200 V source?
Answer» A bulb is marked $220 V, 100 W$ . What will be the current in the filament, when connected to $200 V$ source?

Discussion

9675.	The maximum angular magnification produced by an astronomical telescope is 30. Find the focal length of the objective lens, if the focal length of the eyepiece is 12.5 cm.
Answer» The maximum angular magnification produced by an astronomical telescope is $30$ . Find the focal length of the objective lens, if the focal length of the eyepiece is $12.5 cm$ .

Discussion

9676.	An electric dipole is at stable equilibrium in a uniform electric field. now the dipole is rotated and released , what is the total time taken by it to return to its original position?(express it in terms of moment of inertia)
Answer» An electric dipole is at stable equilibrium in a uniform electric field. now the dipole is rotated and released , what is the total time taken by it to return to its original position?(express it in terms of moment of inertia)

Discussion

9677.	Two waves represented by y = a sin (ωt − kx) and y = a cos (ωt − kx) are superimposed. The resultant wave will have an amplitude
Answer» Two waves represented by $y = a s i n (ω t - k x)$ and $y = a c o s (ω t - k x)$ are superimposed. The resultant wave will have an amplitude

Discussion

9678.	how many positive integral solutions of 3x +2y= 373
Answer» how many positive integral solutions of 3x +2y= 373

Discussion

9679.	A heavy string of mass m hangs between two fixed points A and B at the same level. The tangents to the string at A and B are at an angle θ with the horizontal as shown in the figure. The tension in the string at the lowest point is
Answer» A heavy string of mass m hangs between two fixed points A and B at the same level. The tangents to the string at A and B are at an angle $θ$ with the horizontal as shown in the figure. The tension in the string at the lowest point is

9679.

A heavy string of mass m hangs between two fixed points A and B at the same level. The tangents to the string at A and B are at an angle θ with the horizontal as shown in the figure. The tension in the string at the lowest point is

Answer»

A heavy string of mass m hangs between two fixed points A and B at the same level. The tangents to the string at A and B are at an angle $θ$ with the horizontal as shown in the figure. The tension in the string at the lowest point is

Discussion

9680.	Using integration, find the area in the first quadrant bounded by the curve y = x\|x\|, the circle x2+y2=2 and the y - axis.
Answer» Using integration, find the area in the first quadrant bounded by the curve y = x\|x\|, the circle $x^{2} + y^{2} = 2$ and the y - axis.

Discussion

9681.	The slope developed at point B of cantilever beam AC as shown in figure is:
Answer» The slope developed at point B of cantilever beam AC as shown in figure is:

Discussion

9682.	If y=2sin2θ+tanθ, then dydθ will be
Answer» If $y = 2 {sin}^{2} θ + tan θ$ , then $\frac{d y}{d θ}$ will be

Discussion

9683.	The ratio of molecular mass of two radioactive substances is32and the ratio of their decay constants is 43.Then the ratio of their activity per mole will be
Answer» The ratio of molecular mass of two radioactive substances is $\frac{3}{2}$ and the ratio of their decay constants is $\frac{4}{3}$ .Then the ratio of their activity per mole will be

Discussion

9684.	Ratio of magnetic dipole moment to the angularmomentum for hydrogen like atoms is (e and m are electronic charge and mass respectively) -e/m -2e/m -e/2m -e/4
Answer» Ratio of magnetic dipole moment to the angularmomentum for hydrogen like atoms is (e and m are electronic charge and mass respectively) -e/m -2e/m -e/2m -e/4

Discussion

9685.	the chloride of solid metallic element contain 57.89% by mass of element.the specific heat of element is 0.0324cal/deg. calculate the exact mass of the element
Answer» the chloride of solid metallic element contain 57.89% by mass of element.the specific heat of element is 0.0324cal/deg. calculate the exact mass of the element

Discussion

9686.	Two identical copper spheres with uniform density each of radius R are in contact with each other. If the gravitational attraction between them is F, then
Answer» Two identical copper spheres with uniform density each of radius $R$ are in contact with each other. If the gravitational attraction between them is $F$ , then

Discussion

9687.	How are the rates of consumption of energy and economic growth connected?
Answer» How are the rates of consumption of energy and economic growth connected?

Discussion

9688.	The coefficient of restitution 'e' for a perfectly elastic collision is
Answer» The coefficient of restitution 'e' for a perfectly elastic collision is

Discussion

9689.	If the distance between the atoms of a diatomic gas remains constant. Its specific heat capacity at constant volume per gram-mole is
Answer» If the distance between the atoms of a diatomic gas remains constant. Its specific heat capacity at constant volume per gram-mole is

Discussion

9690.	Show that the area of the triangle contained between the vectors a and b is one half of the magnitude of a × b.
Answer» Show that the area of the triangle contained between the vectors a and b is one half of the magnitude of a × b.

Discussion

9691.	what is equation of plane EM waves?
Answer» what is equation of plane EM waves?

Discussion

9692.	A comet orbits the sun in a highly elliptical orbit. Does the comet have a constant (a) linear speed, (b) angular speed, (c) angular momentum, (d) kinetic energy, (e) potential energy, (f) total energy throughout its orbit? Neglect any mass loss of the comet when it comes very close to the Sun.
Answer» A comet orbits the sun in a highly elliptical orbit. Does the comet have a constant (a) linear speed, (b) angular speed, (c) angular momentum, (d) kinetic energy, (e) potential energy, (f) total energy throughout its orbit? Neglect any mass loss of the comet when it comes very close to the Sun.

Discussion

9693.	a ball reaches a racket at 60m/s along +x axis direction,and leaves the racket in the opposite direction with the same speed .assuming that the mass of the ball as 50gm and exerted by the racket on the ball is
Answer» a ball reaches a racket at 60m/s along +x axis direction,and leaves the racket in the opposite direction with the same speed .assuming that the mass of the ball as 50gm and exerted by the racket on the ball is

Discussion

9694.	Two inductors of induc†an ce 8 H and 4 H are connected in series and their mutual induc†an ce is 3 H and positive coupling is taking place, then resul†an t induc†an ce is ? what does positive coupling mean
Answer» Two inductors of induc†an ce 8 H and 4 H are connected in series and their mutual induc†an ce is 3 H and positive coupling is taking place, then resul†an t induc†an ce is ? what does positive coupling mean

Discussion

9695.	If a charged particle 'q' projected from origin is V=Voi^. In a magnetic field B= -Bok^. Find the value of 'y' if co-ordinate (0,y,0) if is on the path of charged particle.
Answer» If a charged particle 'q' projected from origin is V=Voi^. In a magnetic field B= -Bok^. Find the value of 'y' if co-ordinate (0,y,0) if is on the path of charged particle.

Discussion

9696.	Frequency of oscillation of a body is 6Hz when F1 is applied and 8Hz when F2 is applied. if both forces F1 and F2 are applied together then find out the frequency of oscillation? Give solution with detailed explanation
Answer» Frequency of oscillation of a body is 6Hz when F1 is applied and 8Hz when F2 is applied. if both forces F1 and F2 are applied together then find out the frequency of oscillation? Give solution with detailed explanation

Discussion

9697.	A block of mass m is suspended from a pulley in the form of a circular disc of mass m and radius R. The system is released from rest. Find the angular velocity of the disc when the block has dropped by height h. [Assume there is no slipping between string & pulley]
Answer» A block of mass $m$ is suspended from a pulley in the form of a circular disc of mass $m$ and radius $R$ . The system is released from rest. Find the angular velocity of the disc when the block has dropped by height $h$ . [Assume there is no slipping between string & pulley]

Discussion

9698.	The majority charge carriers in P-type semiconductor are
Answer» The majority charge carriers in P-type semiconductor are

Discussion

9699.	Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (Eg)C, (Eg)Si and (Eg)Ge. Which of the following statements is true? (a) (Eg)Si < (Eg)Ge < (Eg)C(b) (Eg)C< (Eg)Ge > (Eg)Si(c) (Eg)C> (Eg)Si > (Eg)Ge(d) (Eg)C= (Eg)Si = (Eg)Ge
Answer» Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (Eg)C, (Eg)Si and (Eg)Ge. Which of the following statements is true? (a) (Eg)Si < (Eg)Ge < (Eg)C (b) (Eg)C< (Eg)Ge > (Eg)Si (c) (Eg)C> (Eg)Si > (Eg)Ge (d) (Eg)C= (Eg)Si = (Eg)Ge

9699.

Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (Eg)C, (Eg)Si and (Eg)Ge. Which of the following statements is true? (a) (Eg)Si < (Eg)Ge < (Eg)C(b) (Eg)C< (Eg)Ge > (Eg)Si(c) (Eg)C> (Eg)Si > (Eg)Ge(d) (Eg)C= (Eg)Si = (Eg)Ge

Answer»

Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (Eg)C, (Eg)Si and (Eg)Ge. Which of the following statements is true? (a) (Eg)Si < (Eg)Ge < (Eg)C

(b) (Eg)C< (Eg)Ge > (Eg)Si

(c) (Eg)C> (Eg)Si > (Eg)Ge

(d) (Eg)C= (Eg)Si = (Eg)Ge

Discussion

9700.	L/R has dimensions same as that of
Answer» L/R has dimensions same as that of

Discussion

Explore topic-wise InterviewSolutions in .

The radius of gyration of a uniform disc about a line perpendicular to the disc equals its radius. Find the distance of the line from the centre.

A 555 timer is configured as an astable mode with RA=4kΩ,RB=4kΩ and C=0.01μF.then the duly cycle of the output wave will be....66.67

A particle is projected with horizontal surface with 2/7 m/sec at an angle 60 with horizontal Angular speed of the particle is at the highest point with respect to point of projection is

A horizontal force F acts on a solid sphere of mass M at its centre. Coefficient of friction between the ground and sphere is μ. Let the maximum force F for which there is no slipping be n2μMg. Find n.

In a certain process a gas absorbs q amount of heat and performs nq amount of work the molar heat capacity pf the gas in the process is

A weight lifter lifts 300 kg from the ground to a height of 2 meter in 3 second. The average power generated by him is

The equivalent inductance of two dissimilar inductors is 2.4 H, when connected in parallel and 10 H, when connected in series. The inductance of one of the inductors is -

During pure orthogonal turning operation of a hollow clindrical pipe, it is found that the thickness of the chip produced is 0.5mm. The feed given to the zero degree rake angle tool is 0.2mm/rev. The shear strain produced durign the operation is

32.What is the time of flight- 1, when a projectile is projected upward from height 2, When a prjotile is thrown at an angle, from a height downward

For a particle thrown from the ground obliquely u= (5i + 6j) a= (0i - 10j) the horizontal level range of particle is 12m,. 3m.,.6m,. 10m

Three mass of m,m, 2m are placed on the vertices of an equilateral triangle ABC of side l. The force acting on a mass 2m placed at the centroid O of the triangle is?

The standard electrode potentials of Zn2+/Zn and Ag+/Ag are -0.763 V and +0.799 V respectively. The standard potential of the cell is [KCET 1993]

In the figure shown , a coil of single turn is wound on a sphere of radius R and mass m. The plane of the coil is parallel to the plane and lies in the equitorial plane of sphere. Current in the coil is i. Then find the value of B if sphere is in its equilibrium

85. Potential of the point B in the circuit below is2 (1)5 V (2)6 V (3)7 V (4)8 V

Calculate the time for which a motor pump of 10HP and effiency 80% must be switched on so, as to pump 50 kg of water through a vertical height of 20m.[g=10m/s2;1HP=758W].

An AIR station is broadcasting the waves of wavelength 300 metres. If the radiating power of the transmitter is 10 kW, then the number of photons radiated per second is

4: A cell of emf e and internal resistance r is connected across a load resistance R() Find the maximum power delivered at the load?li) Draw the power (P) vs load resistance (R) graph.

Two concentric rings, one of radius ‘a’ and the other of radius ‘b’, have the charges +q, and −(25)−32 respectively, as shown in the figure. Find the ratio ba if a charge particle placed on the axis at z = a is in equilibrium.

Find the direction of the reaction force on the block for the figure shown.

A bulb is marked 220 V, 100 W. What will be the current in the filament, when connected to 200 V source?

The maximum angular magnification produced by an astronomical telescope is 30. Find the focal length of the objective lens, if the focal length of the eyepiece is 12.5 cm.

An electric dipole is at stable equilibrium in a uniform electric field. now the dipole is rotated and released , what is the total time taken by it to return to its original position?(express it in terms of moment of inertia)

Two waves represented by y = a sin (ωt − kx) and y = a cos (ωt − kx) are superimposed. The resultant wave will have an amplitude

how many positive integral solutions of 3x +2y= 373

A heavy string of mass m hangs between two fixed points A and B at the same level. The tangents to the string at A and B are at an angle θ with the horizontal as shown in the figure. The tension in the string at the lowest point is

Using integration, find the area in the first quadrant bounded by the curve y = x|x|, the circle x2+y2=2 and the y - axis.

The slope developed at point B of cantilever beam AC as shown in figure is:

If y=2sin2θ+tanθ, then dydθ will be

The ratio of molecular mass of two radioactive substances is32and the ratio of their decay constants is 43.Then the ratio of their activity per mole will be

Ratio of magnetic dipole moment to the angularmomentum for hydrogen like atoms is (e and m are electronic charge and mass respectively) -e/m -2e/m -e/2m -e/4

the chloride of solid metallic element contain 57.89% by mass of element.the specific heat of element is 0.0324cal/deg. calculate the exact mass of the element

Two identical copper spheres with uniform density each of radius R are in contact with each other. If the gravitational attraction between them is F, then

How are the rates of consumption of energy and economic growth connected?

The coefficient of restitution 'e' for a perfectly elastic collision is

If the distance between the atoms of a diatomic gas remains constant. Its specific heat capacity at constant volume per gram-mole is

Show that the area of the triangle contained between the vectors a and b is one half of the magnitude of a × b.

what is equation of plane EM waves?

A comet orbits the sun in a highly elliptical orbit. Does the comet have a constant (a) linear speed, (b) angular speed, (c) angular momentum, (d) kinetic energy, (e) potential energy, (f) total energy throughout its orbit? Neglect any mass loss of the comet when it comes very close to the Sun.

a ball reaches a racket at 60m/s along +x axis direction,and leaves the racket in the opposite direction with the same speed .assuming that the mass of the ball as 50gm and exerted by the racket on the ball is

Two inductors of induc†an ce 8 H and 4 H are connected in series and their mutual induc†an ce is 3 H and positive coupling is taking place, then resul†an t induc†an ce is ? what does positive coupling mean

If a charged particle 'q' projected from origin is V=Voi^. In a magnetic field B= -Bok^. Find the value of 'y' if co-ordinate (0,y,0) if is on the path of charged particle.

Frequency of oscillation of a body is 6Hz when F1 is applied and 8Hz when F2 is applied. if both forces F1 and F2 are applied together then find out the frequency of oscillation? Give solution with detailed explanation

A block of mass m is suspended from a pulley in the form of a circular disc of mass m and radius R. The system is released from rest. Find the angular velocity of the disc when the block has dropped by height h. [Assume there is no slipping between string &amp; pulley]

The majority charge carriers in P-type semiconductor are

L/R has dimensions same as that of

A block of mass m is suspended from a pulley in the form of a circular disc of mass m and radius R. The system is released from rest. Find the angular velocity of the disc when the block has dropped by height h. [Assume there is no slipping between string & pulley]