First slide

Photo Electric Effect

Question

When green light is incident on the surface of metal, it emits photo-electrons but there is no such emission with yellow colour light. Which one of the colours can produce emission of photo-electrons?

Easy

A

Orange
B

Red
C

Indigo
D

None of the above

Solution

Wavelength of green light is threshold wave length. Hence for emission of electron, wavelength of incident light < wavelength of green light.

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