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

Red

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Indigo

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Orange

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None of these

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Solution

The correct option is C Indigo
Wavelength of green light is threshold wave length. For emission of electron, wavelength of incident light should be smaller than wavelength of green light. Hence, in the given lights indigo can produce emission of photo electrons.

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