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If blue light emits electrons from a photosensitive surface, then electrons must also be emitted by...

If blue light emits electrons from a photosensitive surface, then electrons must also be emitted by

a. ultraviolet light
b. green light
c. orange light
d. infrared light

im having trouble understanding this question

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Answer #1

(a) ultraviolet

Following radiations are arranged in order of increasing frequency

Radio wave< microwave<infra red <visible<ultra violet<X ray<gamma rays

In visible light there are light waves of seven colours in increasing frequency :

Red<orange<yellow<green<blue<indigo<violet.

Clearly out of given options in question, only ultraviolet has greater frequency than blue light. Therefore only photon of uv light gas greater energy ( E= hv) hence it would be able to emit electron.

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