50278 + Interview Questions in Physics Page 299 InterviewSolution

14901.	2.1.what happens when an electric dipole is placed in a non uniform electric field. 2.what is the dimensional formula of potential gradient
Answer» 2.1.what happens when an electric dipole is placed in a non uniform electric field. 2.what is the dimensional formula of potential gradient

Discussion

14902.	In the situation shown in the figure, three lenses of focal lengths 20 cm, 30 cm and 36 cm are held coaxial such that separation between first and second lens is 12 cm and between second and third lens is 10 cm. If the final image of an object at a distance of 30 cm from first lens is at a distance 10x cm from the middle lens, then find the value of x.
Answer» In the situation shown in the figure, three lenses of focal lengths $20 cm, 30 cm$ and $36 cm$ are held coaxial such that separation between first and second lens is $12 cm$ and between second and third lens is $10 cm$ . If the final image of an object at a distance of $30 cm$ from first lens is at a distance $10 x cm$ from the middle lens, then find the value of $x$ .

Discussion

14903.	A uniform metre scale of length 1 m is balanced on a fixed semi-circular cylinder of radius 30 cm as shown in the figure. One end of the scale is slightly depressed and released. Taking g=10 ms−2, the time period (in seconds) of the resulting simple harmonic motion is
Answer» A uniform metre scale of length 1 m is balanced on a fixed semi-circular cylinder of radius 30 cm as shown in the figure. One end of the scale is slightly depressed and released. Taking $g = 10 m s^{- 2}$ , the time period (in seconds) of the resulting simple harmonic motion is

Discussion

14904.	Two particles which are initially at rest move towards each under the action of their internal attraction . If their speeds are v and 2v any instant, then the speed of center of mass of the system will be ??
Answer» Two particles which are initially at rest move towards each under the action of their internal attraction . If their speeds are v and 2v any instant, then the speed of center of mass of the system will be ??

Discussion

14905.	A block of mass M is kept on a rough horizontal surface. The coefficient of static friction between the block and the surface is μ. the block is to be pulled by applying a force to it. what minimum force is needed to slide the block ? In which direction should this force act?
Answer» A block of mass M is kept on a rough horizontal surface. The coefficient of static friction between the block and the surface is $μ .$ the block is to be pulled by applying a force to it. what minimum force is needed to slide the block ? In which direction should this force act?

Discussion

14906.	a parallel plate capacitor is filled by a dielectric whose relative permittivity varies with the applied charge voltage(u)as∈=α U where α=2 V^-1.A similar capacitor with no dielectric is charged to U'=78V It is connected to the uncharged capacitor with the dielectric find the voltage on the capacit
Answer» a parallel plate capacitor is filled by a dielectric whose relative permittivity varies with the applied charge voltage(u)as∈=α U where α=2 V^-1.A similar capacitor with no dielectric is charged to U'=78V It is connected to the uncharged capacitor with the dielectric find the voltage on the capacit

Discussion

14907.	A cricketer can throw a ball to the maximum horizontal distance of 100 m. How much high above the ground can the cricketer throw the same ball?
Answer» A cricketer can throw a ball to the maximum horizontal distance of 100 m. How much high above the ground can the cricketer throw the same ball?

Discussion

14908.	Average heat produced per unit time during a cycle of AC is the same as produced by DC with current i=
Answer» Average heat produced per unit time during a cycle of $A C$ is the same as produced by $D C$ with current $i =$

Discussion

14909.	The root mean square speed of the molecules of a gas is 1260 m/s. The average speed of the molecules is
Answer» The root mean square speed of the molecules of a gas is $1260 m/s$ . The average speed of the molecules is

Discussion

14910.	∫(1x−ex−13)dx is equal to
Answer» $\int (\frac{1}{x} - e^{x} - \frac{1}{3}) d x$ is equal to

Discussion

14911.	73.If two identical spheres having charge 16uc and -8uc are kept at certain distance apart, then the force is F. they are touched and again kept at the same distance then calculate the force.
Answer» 73.If two identical spheres having charge 16uc and -8uc are kept at certain distance apart, then the force is F. they are touched and again kept at the same distance then calculate the force.

Discussion

14912.	A particle of mass 0.1 kg is moving in a circular path of radius, r=0.2 m such that centripetal acceleration is varying with time t as 100rt2. The power delivered to the particle by the force acting on it at t=10 sec is,
Answer» A particle of mass $0.1 kg$ is moving in a circular path of radius, $r = 0.2 m$ such that centripetal acceleration is varying with time $t$ as $100 r t^{2}$ . The power delivered to the particle by the force acting on it at $t = 10 sec$ is,

Discussion

14913.	differential coefficient of \log 10 x wrt \log x10 is
Answer» differential coefficient of \log 10 x wrt \log x10 is

Discussion

14914.	Two gases of equal mass are in thermal equilibrium. If Pa,Pb and Va and Vb are their respective pressures and volumes, then which relation is true
Answer» Two gases of equal mass are in thermal equilibrium. If $P_{a}, P_{b}$ and $V_{a}$ and $V_{b}$ are their respective pressures and volumes, then which relation is true

14914.

Two gases of equal mass are in thermal equilibrium. If Pa,Pb and Va and Vb are their respective pressures and volumes, then which relation is true

Answer»

Two gases of equal mass are in thermal equilibrium. If $P_{a}, P_{b}$ and $V_{a}$ and $V_{b}$ are their respective pressures and volumes, then which relation is true

Discussion

14915.	A lamp consumes only 50% of peak power in an a.c. circuit. What is the phase difference between the applied voltage and the circuit current
Answer» A lamp consumes only $50 %$ of peak power in an a.c. circuit. What is the phase difference between the applied voltage and the circuit current

Discussion

14916.	The magnetic field lines due to a bar magnet are correctly shown in [1 Mark]
Answer» The magnetic field lines due to a bar magnet are correctly shown in $[$ 1 Mark $]$

Discussion

14917.	A point mass m is suspended from a light thread of length l, fixed at O, is whirled in a horizontal circle at constant speed as shown. From your point of view, stationary with respect to the mass, the forces on the mass are
Answer» A point mass m is suspended from a light thread of length l, fixed at O, is whirled in a horizontal circle at constant speed as shown. From your point of view, stationary with respect to the mass, the forces on the mass are

Discussion

14918.	Express the power of a 100 watt bulb in CGS unit.
Answer» Express the power of a 100 watt bulb in CGS unit.

Discussion

14919.	What is the (a) momentum, (b) speed, and (c) de Broglie wavelength of an electron with kinetic energy of 120 eV.
Answer» What is the (a) momentum, (b) speed, and (c) de Broglie wavelength of an electron with kinetic energy of 120 eV.

Discussion

14920.	A source and a detector move away from each other, each with a speed of 10 ms−1 with respect to the ground, with no wind. If the detector detects a frequency 1950 Hz of the sound coming from the source, what is the original frequency of the source ?Speed of sound in air =340 ms−1.
Answer» A source and a detector move away from each other, each with a speed of $10 {ms}^{- 1}$ with respect to the ground, with no wind. If the detector detects a frequency $1950 Hz$ of the sound coming from the source, what is the original frequency of the source ? Speed of sound in air $= 340 {ms}^{- 1}$ .

Discussion

14921.	The material of wire has specific gravity 11. If it is not wetted by water, what is the maximum diameter (approximately) of the wire that will float on the surface of water (T70 dyne/cm)
Answer» The material of wire has specific gravity 11. If it is not wetted by water, what is the maximum diameter (approximately) of the wire that will float on the surface of water (T70 dyne/cm)

Discussion

14922.	A block of mass m takes time t to slide down on a smooth inclined plane of angle of inclination θ and height h .If same block slids down on a rough inclined plane of same angle of inclination and same height and takes time n times of initial value,then coefficient frictiin between block and inclined plane is -(1+n^2) †anθ -(1-1/n^2)†anθ -(1-n^2)†anθ -(1+1/n2)ta -
Answer» A block of mass m takes time t to slide down on a smooth inclined plane of angle of inclination θ and height h .If same block slids down on a rough inclined plane of same angle of inclination and same height and takes time n times of initial value,then coefficient frictiin between block and inclined plane is -(1+n^2) †anθ -(1-1/n^2)†anθ -(1-n^2)†anθ -(1+1/n2)ta -

Discussion

14923.	A cell of emf 2.1 V and internal resistance 0.2 ohm is connected to a 4 ohm external resistance. The potential difference across the terminal of the cell is
Answer» A cell of emf 2.1 V and internal resistance 0.2 ohm is connected to a 4 ohm external resistance. The potential difference across the terminal of the cell is

Discussion

14924.	If u1 and u2 are the units selected in two systems of unit of any physical quantity and n1 and n2 are their numerical values then
Answer» If $u_{1}$ and $u_{2}$ are the units selected in two systems of unit of any physical quantity and $n_{1}$ and $n_{2}$ are their numerical values then

Discussion

14925.	Find the threshold wavelength of light that would eject photoelectrons for a silver surface. The work function for silver is 4.8 eV. (Given hc=1240 eV nm)
Answer» Find the threshold wavelength of light that would eject photoelectrons for a silver surface. The work function for silver is $4.8 eV$ . (Given $h c = 1240 eV nm$ )

Discussion

14926.	A body of mass 2 kg is hung on a spring balance mounted vertically in a lift. If the lift descends with an acceleration equal to the acceleration due to gravity ‘g’, the reading on the spring balance will be
Answer» A body of mass 2 kg is hung on a spring balance mounted vertically in a lift. If the lift descends with an acceleration equal to the acceleration due to gravity ‘g’, the reading on the spring balance will be

Discussion

14927.	A ladder is slipping with its ends against a vertical wall and a horizontal floor. At a certain moment, the speed of the end in contact with the horizontal floor is 3 m/s and the ladder makes an angle 30∘ with horizontal. Then, the speed of the ladder's centre of mass must be
Answer» A ladder is slipping with its ends against a vertical wall and a horizontal floor. At a certain moment, the speed of the end in contact with the horizontal floor is $3 m/s$ and the ladder makes an angle $30^{\circ}$ with horizontal. Then, the speed of the ladder's centre of mass must be

Discussion

14928.	The displacement of the particle is given by x=3t3+6t2+2t+5 in m. The instantaneous speed of the particle at 4 sec is
Answer» The displacement of the particle is given by $x = 3 t^{3} + 6 t^{2} + 2 t + 5$ in $m$ . The instantaneous speed of the particle at $4 sec$ is

Discussion

14929.	For a given →E=2x^i+3y^j. Find the potential V at (2, 2) , when V at origin is 5 volts.
Answer» For a given $\to E = 2 x^i + 3 y^j$ . Find the potential $V$ at $(2, 2)$ , when $V$ at origin is $5 volts$ .

Discussion

14930.	Through two parallel wires x and y, currents of 10A and 2A, respectively are passed in opposite directions. X is infinitely long and y has a length of 2m. The distance between them is 10cm. The magnetic force on y is
Answer» Through two parallel wires x and y, currents of 10A and 2A, respectively are passed in opposite directions. X is infinitely long and y has a length of 2m. The distance between them is 10cm. The magnetic force on y is

Discussion

14931.	The circuit has two oppositely connected, ideal diodes, in parallel. What is the current flowing in the circuit?
Answer» The circuit has two oppositely connected, ideal diodes, in parallel. What is the current flowing in the circuit?

Discussion

14932.	If we place a point charge q near the surface of a metal sphere( whose charge is Q) and its distance from the center of the sphere is r, will the force between them be less than kQq/r2?
Answer» If we place a point charge q near the surface of a metal sphere( whose charge is Q) and its distance from the center of the sphere is r, will the force between them be less than kQq/r2?

Discussion

14933.	What is boiling ? Explain it on the basis of molecular motion?
Answer» What is boiling ? Explain it on the basis of molecular motion?

Discussion

14934.	The current in the winding of a toroid is 2.0 A. There are 950 turns and the mean circumferential length is 19π cm. If the magnetic field inside the toroid is 2 T, then the magnetic susceptibility of core is
Answer» The current in the winding of a toroid is $2.0 A$ . There are $950$ turns and the mean circumferential length is $19 π cm$ . If the magnetic field inside the toroid is $2 T$ , then the magnetic susceptibility of core is

Discussion

14935.	On a particular day, the maximum frequency reflected from the ionosphere is 10 MHz. On another day, it was found to increase to 11 MHz. Calculate the ratio of maximum electron density of the ionosphere on the two days.
Answer» On a particular day, the maximum frequency reflected from the ionosphere is $10 MHz$ . On another day, it was found to increase to $11 MHz$ . Calculate the ratio of maximum electron density of the ionosphere on the two days.

Discussion

14936.	A wire is sliding on two parallel conducting rails placed at a separation of 1 m as shown in figure. A uniform magnetic field of 2 T exists in a direction perpendicular to rails. What force F is necessary to keep the wire moving with a constant velocity of 1 cm/s?
Answer» A wire is sliding on two parallel conducting rails placed at a separation of $1 m$ as shown in figure. A uniform magnetic field of $2 T$ exists in a direction perpendicular to rails. What force $F$ is necessary to keep the wire moving with a constant velocity of $1 cm/s$ ?

Discussion

14937.	3.can some one explain to me the concept of X-ray diffraction. Is it the same one done int he Moseley's Experiment. Thanks in advance, regards.
Answer» 3.can some one explain to me the concept of X-ray diffraction. Is it the same one done int he Moseley's Experiment. Thanks in advance, regards.

Discussion

14938.	A solid body rotates about a fixed axis such that itsangular velocity depends on θ as ω=kθ-1 where k is a positive constants. At t= 0, θ = 0, then timedependence ofθ is given as(1) kt(2) 0 2kt4) 0 2kt
Answer» A solid body rotates about a fixed axis such that itsangular velocity depends on θ as ω=kθ-1 where k is a positive constants. At t= 0, θ = 0, then timedependence ofθ is given as(1) kt(2) 0 2kt4) 0 2kt

Discussion

14939.	What is the direction of the net force on the particle due to the fields at the instant it enters?
Answer» What is the direction of the net force on the particle due to the fields at the instant it enters?

14939.

What is the direction of the net force on the particle due to the fields at the instant it enters?

Answer»

What is the direction of the net force on the particle due to the fields at the instant it enters?

Discussion

14940.	2. Why VOSO4 paramagnetic&coloured?
Answer» 2. Why VOSO4 paramagnetic&coloured?

Discussion

14941.	Water is flowing in a streamline down a plane having the inclination of 300 with the horizontal. A box ABCD attached with the wall is floating on the surface of the water keeping face CD of the box downward as shown in the figure. The box has a weight of 200 N and area of the base is 1m2 . If the velocity of the streamline at a distance of 1mm from the base CD is 0.1 m/s. Then the tension in the string connecting the block to the wall as shown is (Given viscosity of water =0.1 N-s/m2)
Answer» Water is flowing in a streamline down a plane having the inclination of $30^{0}$ with the horizontal. A box ABCD attached with the wall is floating on the surface of the water keeping face CD of the box downward as shown in the figure. The box has a weight of 200 N and area of the base is $1 m^{2}$ . If the velocity of the streamline at a distance of 1mm from the base CD is 0.1 m/s. Then the tension in the string connecting the block to the wall as shown is (Given viscosity of water $= 0.1 N-s / m^{2}$ )

14941.

Water is flowing in a streamline down a plane having the inclination of 300 with the horizontal. A box ABCD attached with the wall is floating on the surface of the water keeping face CD of the box downward as shown in the figure. The box has a weight of 200 N and area of the base is 1m2 . If the velocity of the streamline at a distance of 1mm from the base CD is 0.1 m/s. Then the tension in the string connecting the block to the wall as shown is (Given viscosity of water =0.1 N-s/m2)

Answer»

Water is flowing in a streamline down a plane having the inclination of $30^{0}$ with the horizontal. A box ABCD attached with the wall is floating on the surface of the water keeping face CD of the box downward as shown in the figure. The box has a weight of 200 N and area of the base is $1 m^{2}$ . If the velocity of the streamline at a distance of 1mm from the base CD is 0.1 m/s. Then the tension in the string connecting the block to the wall as shown is (Given viscosity of water $= 0.1 N-s / m^{2}$ )

Discussion

14942.	Angular momentum of a planet of mass m orbiting around sun is J, areal velocity of its radius vector will be
Answer» Angular momentum of a planet of mass m orbiting around sun is J, areal velocity of its radius vector will be

Discussion

14943.	If the distribution of molecular speeds of gas is as per the figure shown below, then the ratio of the most probable, the average, and the root mean square speeds, respectively, is:
Answer» If the distribution of molecular speeds of gas is as per the figure shown below, then the ratio of the most probable, the average, and the root mean square speeds, respectively, is:

Discussion

14944.	A ball is in free fall. Its acceleration is?
Answer» A ball is in free fall. Its acceleration is?

Discussion

14945.	a ship is sailing due west according to mariners compass.if the declination at the plce is 17^° west ,what should be direction of shi
Answer» a ship is sailing due west according to mariners compass.if the declination at the plce is 17^° west ,what should be direction of shi

Discussion

14946.	The phase difference between two points separated by 0.8 m in a wave of frequency 120 Hz is 0.5π. The velocity of wave will be
Answer» The phase difference between two points separated by $0.8 m$ in a wave of frequency $120 Hz$ is $0.5 π$ . The velocity of wave will be

Discussion

14947.	Consider the situation shown in figure.The plates of the capacitor have plate area A and are clamped in the laboratory. The dielectirc slab is released from rest with a length a inside the capacitor. Neglecting any effect of friction or gravity, show that the slab will execute periodic motion and find its time period.
Answer» Consider the situation shown in figure. The plates of the capacitor have plate area $A$ and are clamped in the laboratory. The dielectirc slab is released from rest with a length $a$ inside the capacitor. Neglecting any effect of friction or gravity, show that the slab will execute periodic motion and find its time period.

Discussion

14948.	A zener diode having zener voltage 8 V and power dissipation rating of 0.5 W is connected across a potential divider arranged with maximum potential drop across zener diode is as shown in the diagram. The value of protective resistance Rp is ______Ω.
Answer» A zener diode having zener voltage $8 V$ and power dissipation rating of $0.5 W$ is connected across a potential divider arranged with maximum potential drop across zener diode is as shown in the diagram. The value of protective resistance $R_{p}$ is ______ $Ω$ .

Discussion

14949.	The given setup is in equilibrium. Springs were in natural length before the force was applied. If I have to replace the above setup of 1 block and 2 springs by 1 block and 1 spring, what will be the spring constant of that new spring such that the block is displaced by the same amount as previously?
Answer» The given setup is in equilibrium. Springs were in natural length before the force was applied. If I have to replace the above setup of 1 block and 2 springs by 1 block and 1 spring, what will be the spring constant of that new spring such that the block is displaced by the same amount as previously?

14949.

The given setup is in equilibrium. Springs were in natural length before the force was applied. If I have to replace the above setup of 1 block and 2 springs by 1 block and 1 spring, what will be the spring constant of that new spring such that the block is displaced by the same amount as previously?

Answer»

The given setup is in equilibrium. Springs were in natural length before the force was applied. If I have to replace the above setup of 1 block and 2 springs by 1 block and 1 spring, what will be the spring constant of that new spring such that the block is displaced by the same amount as previously?

Discussion

14950.	The solid angle subtended by the periphery of square of side 5 cm at a point situated symmetrically at a distance of 10 cm from the square is :
Answer» The solid angle subtended by the periphery of square of side $5 cm$ at a point situated symmetrically at a distance of $10 cm$ from the square is :

Discussion

Explore topic-wise InterviewSolutions in .

2.1.what happens when an electric dipole is placed in a non uniform electric field. 2.what is the dimensional formula of potential gradient

A uniform metre scale of length 1 m is balanced on a fixed semi-circular cylinder of radius 30 cm as shown in the figure. One end of the scale is slightly depressed and released. Taking g=10 ms−2, the time period (in seconds) of the resulting simple harmonic motion is

Two particles which are initially at rest move towards each under the action of their internal attraction . If their speeds are v and 2v any instant, then the speed of center of mass of the system will be ??

A block of mass M is kept on a rough horizontal surface. The coefficient of static friction between the block and the surface is μ. the block is to be pulled by applying a force to it. what minimum force is needed to slide the block ? In which direction should this force act?

A cricketer can throw a ball to the maximum horizontal distance of 100 m. How much high above the ground can the cricketer throw the same ball?

Average heat produced per unit time during a cycle of AC is the same as produced by DC with current i=

The root mean square speed of the molecules of a gas is 1260 m/s. The average speed of the molecules is

∫(1x−ex−13)dx is equal to

73.If two identical spheres having charge 16uc and -8uc are kept at certain distance apart, then the force is F. they are touched and again kept at the same distance then calculate the force.

A particle of mass 0.1 kg is moving in a circular path of radius, r=0.2 m such that centripetal acceleration is varying with time t as 100rt2. The power delivered to the particle by the force acting on it at t=10 sec is,

differential coefficient of \log 10 x wrt \log x10 is

Two gases of equal mass are in thermal equilibrium. If Pa,Pb and Va and Vb are their respective pressures and volumes, then which relation is true

A lamp consumes only 50% of peak power in an a.c. circuit. What is the phase difference between the applied voltage and the circuit current

The magnetic field lines due to a bar magnet are correctly shown in [1 Mark]

A point mass m is suspended from a light thread of length l, fixed at O, is whirled in a horizontal circle at constant speed as shown. From your point of view, stationary with respect to the mass, the forces on the mass are

Express the power of a 100 watt bulb in CGS unit.

What is the (a) momentum, (b) speed, and (c) de Broglie wavelength of an electron with kinetic energy of 120 eV.

A source and a detector move away from each other, each with a speed of 10 ms−1 with respect to the ground, with no wind. If the detector detects a frequency 1950 Hz of the sound coming from the source, what is the original frequency of the source ?Speed of sound in air =340 ms−1.

The material of wire has specific gravity 11. If it is not wetted by water, what is the maximum diameter (approximately) of the wire that will float on the surface of water (T70 dyne/cm)

A cell of emf 2.1 V and internal resistance 0.2 ohm is connected to a 4 ohm external resistance. The potential difference across the terminal of the cell is

If u1 and u2 are the units selected in two systems of unit of any physical quantity and n1 and n2 are their numerical values then

Find the threshold wavelength of light that would eject photoelectrons for a silver surface. The work function for silver is 4.8 eV. (Given hc=1240 eV nm)

A body of mass 2 kg is hung on a spring balance mounted vertically in a lift. If the lift descends with an acceleration equal to the acceleration due to gravity ‘g’, the reading on the spring balance will be

A ladder is slipping with its ends against a vertical wall and a horizontal floor. At a certain moment, the speed of the end in contact with the horizontal floor is 3 m/s and the ladder makes an angle 30∘ with horizontal. Then, the speed of the ladder's centre of mass must be

The displacement of the particle is given by x=3t3+6t2+2t+5 in m. The instantaneous speed of the particle at 4 sec is

For a given →E=2x^i+3y^j. Find the potential V at (2, 2) , when V at origin is 5 volts.

Through two parallel wires x and y, currents of 10A and 2A, respectively are passed in opposite directions. X is infinitely long and y has a length of 2m. The distance between them is 10cm. The magnetic force on y is

The circuit has two oppositely connected, ideal diodes, in parallel. What is the current flowing in the circuit?

If we place a point charge q near the surface of a metal sphere( whose charge is Q) and its distance from the center of the sphere is r, will the force between them be less than kQq/r2?

What is boiling ? Explain it on the basis of molecular motion?

The current in the winding of a toroid is 2.0 A. There are 950 turns and the mean circumferential length is 19π cm. If the magnetic field inside the toroid is 2 T, then the magnetic susceptibility of core is

On a particular day, the maximum frequency reflected from the ionosphere is 10 MHz. On another day, it was found to increase to 11 MHz. Calculate the ratio of maximum electron density of the ionosphere on the two days.

A wire is sliding on two parallel conducting rails placed at a separation of 1 m as shown in figure. A uniform magnetic field of 2 T exists in a direction perpendicular to rails. What force F is necessary to keep the wire moving with a constant velocity of 1 cm/s?

3.can some one explain to me the concept of X-ray diffraction. Is it the same one done int he Moseley's Experiment. Thanks in advance, regards.

A solid body rotates about a fixed axis such that itsangular velocity depends on θ as ω=kθ-1 where k is a positive constants. At t= 0, θ = 0, then timedependence ofθ is given as(1) kt(2) 0 2kt4) 0 2kt

What is the direction of the net force on the particle due to the fields at the instant it enters?

2. Why VOSO4 paramagnetic&coloured?

Angular momentum of a planet of mass m orbiting around sun is J, areal velocity of its radius vector will be

If the distribution of molecular speeds of gas is as per the figure shown below, then the ratio of the most probable, the average, and the root mean square speeds, respectively, is:

A ball is in free fall. Its acceleration is?

a ship is sailing due west according to mariners compass.if the declination at the plce is 17^° west ,what should be direction of shi

The phase difference between two points separated by 0.8 m in a wave of frequency 120 Hz is 0.5π. The velocity of wave will be

A zener diode having zener voltage 8 V and power dissipation rating of 0.5 W is connected across a potential divider arranged with maximum potential drop across zener diode is as shown in the diagram. The value of protective resistance Rp is ______Ω.

The solid angle subtended by the periphery of square of side 5 cm at a point situated symmetrically at a distance of 10 cm from the square is :