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?
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a
Orange
b
Red
c
Indigo
d
None of the above
answer is C.
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Detailed Solution
Wavelength of green light is threshold wave length. Hence for emission of electron, wavelength of incident light < wavelength of green light.