Electron Test

Result

Electron Test - 3

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Question 1
1 / -0

A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed ½ m away, the number of electrons emitted by photocathode would

A
decrease by a factor of 4

B
increase by a factor of 4

C
decrease by a factor of 2

D
increase by a factor of 2

Solution

On doubling the distance the intensity becomes one fourth i.e. only one fourth of photons now strike the target in comparison to the previous number.
Since photoelectric effect is a one photon-one electron phenomena, so only one-fourth photoelectrons are emitted out of the target hence reducing the current to one fourth the previous value.
Question 2
1 / -0

Consider the following two statements A and B, and identify the correct answer.

A: For electrons, the value of specific charge depends upon the gas taken in the tube.
B: Increase in the intensity of incident radiation in photoelectric emission increases the number of photoelectrons.

A
Both A and B are true

B
A is true but B is false

C
A is false but B is true

D
Both A and B are false

Solution

Specific charge of electrons is independent of gas taken.
Increase in photo intensity increases the number of electrons.