First slide

Photo Electric Effect

Question

A photosensitive metal is not emitting photo-electrons when irradiated. It will do so when threshold is crossed. To cross threshold we need to 6. increase

Easy

A

intensity
B

frequency
C

wavelength
D

none of the above

Solution

When the frequency of incident radiation is increased, then the energy of photon increases. When energy of photons becomes greater than work function $(W = {hv}_{0})$ then photo-electrons are emitted.

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