Assertion (A) : When ultraviolet light is incident on a photocell, its stopping potential is V 0 and the maximum kinetic energy of the photoelectrons is Kmax. When the ultraviolet light is replaced by infrared light, both V 0 and Kmax increase.
Reason (R) : Photoelectrons are emitted with speeds ranging from zero to a maximum value.
Answer & explanation
Correct answer: option 4
The kinetic energy of photoelectrons in case of infrared rays will be less than that in case of UV rays. This is because frequency of IR-Rays is less than that of UV-Rays.