Question

As intensity of light increases

a) photocurrent increases

b) photocurrent decreases

c) kinetic energy of emitted photoelectrons increases

d) kinetic energy of emitted photoelectrons decreases.​

Answer 1

Answer:

According to Einstein's theory of phototelectric effect a single incident photon ejects a single electron. Therefore, when intensity increases, the number of incident photons increases, so number of ejected electrons increases, hence, photocurrent increases

Now, maximum energy of electron =

2

1

mv

max

2

and

2

1

mv

max

2

=eV

0

, where V

0

is stopping potential.

Thus, the maximum kinetic energy of the electrons does not depend upon the intensity of the incident rays, because the stopping potential is not affected by the increase of the intensity of rays.

Answer 2

Answer:

A

Intensity increases means more photons of same energy will emit more electrons of same energy , hence only photoelectric current increases.