When green light is incident on the surf...

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 ?

Orange

Red

Indigo

None of the above

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The correct Answer is:

Wave length of green light is threshold wave length . Hence for emission of electron , wave length of incident light lt wavelength of green light .

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