Home
Class 12
PHYSICS
A photoelectric cell is illuminated by a...

A photoelectric cell is illuminated by a point soures of light 1 m away. When the soures is shifted to 2 m then

A

Each emitted electron carries half the initial energy

B

Number of electrons emitted is a quarter of the initial number

C

Each emitted electron carries one quarter of the initial energy

D

Number of electrons emitted is half the initial number

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Similar Questions

Explore conceptually related problems

A caesium photocell , with a steady potential difference of 60 V across , is alluminated by a bright point source of light 50 cm away. When the same light is placed 1 m away the photoelectrons emitted from the cell

A photo cell is illuminated by a small bright source placed 1m away When the same source of light is placed 2m away, the electrons emitted by photo cathode

A photocell is illuminated by a small bright source places 1 m away when the same source of light is placed (1)/(2) m away. The number of electron emitted by photocathode would be

A photo-cell is illuminated by a source of light which is placed at a distance d from the cell . If the distance become d/2 . Then number of electrons emitted per seconed will be

in an experimental set up to study the photoelectric effect a point soure fo light of power 3.2xx10^(-3) W was taken. The source can emit monoenergetic photons of energy 5eV and is located at a distance of 0.8 m from the centre of a stationary metallic sphere of work-function 3.0 eV. The radius of the sphere is r = 8..10^(-3) m. The efficiency of photoelectric emission is one for every 10^6 incident photons. Based on the information given above answer the questions given below. (Assume that the sphere is isolated and photoelectrons are instantly swepts away after the emission). Time after which photoelectric emission stops is

in an experimental set up to study the photoelectric effect a point soure fo light of power 3.2xx10^(-3) W was taken. The source can emit monoenergetic photons of energy 5eV and is located at a distance of 0.8 m from the centre of a stationary metallic sphere of work-function 3.0 eV. The radius of the sphere is r = 8..10^(-3) m. The efficiency of photoelectric emission is one for every 10^6 incident photons. Based on the information given above answer the questions given below. (Assume that the sphere is isolated and photoelectrons are instantly swepts away after the emission). de-Broglie wavelength of the fastest moving photoelectron is

in an experimental set up to study the photoelectric effect a point soure fo light of power 3.2xx10^(-3) W was taken. The source can emit monoenergetic photons of energy 5eV and is located at a distance of 0.8 m from the centre of a stationary metallic sphere of work-function 3.0 eV. The radius of the sphere is r = 8..10^(-3) m. The efficiency of photoelectric emission is one for every 10^6 incident photons. Based on the information given above answer the questions given below. (Assume that the sphere is isolated and photoelectrons are instantly swepts away after the emission). It was observed that after some time emission of photoelectrons from the sphere stopped. Charge on the sphere when the photon emission stops is

The illuminance of a small -2 area changes from 900 lumen m^-2 to 400 lumen m^-2 when it is shifted along its normal by 10 cm. Assuming that it is illuminated by a point source placed on the normal, find the distance between the source and the area in the original position.

In an experiment to measure the internal resistance of a cell by potentiometer, it is found that the balance point is at a length of 2 m when the cell is shunted by a 4Omega resistance and at 3 m when cell is shunted by a 8Omega resistance. The internal resistance of cell is -

In an experiment to measure the internal resistance of a cell by a potentiometer, it is found that the balance point is at a length of 2 m when the cell is shunted by a 5 Omega resistance and is at a length of 3 m when the cell is shunted by a 10 Omega resistance, the internal resistance of the cell is then