First slide

Quantum Theory of Light

Question

In photoelectric effect, the photo-current

Easy

A

increases with increase of frequency of incident photon
B

decreases with increase of frequency of incident photon
C

does not depend on the frequency of photon but depends only on the intensity of incident light
D

depends both on intensity and frequency of the incident photon

Solution

By increasing frequency, the energy of incident photon is changed but the number of photons is not changed. To increase the photo-current, the number of electrons emitted per second should be increased. This can be done by increasing the incident intensity

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