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Question

When the blue light falls onto a certain metal, no electrons are ejected. Identify which of the following lights might eject electrons from the metal?

A
Red
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B
Yellow
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C
Green
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D
Infrared
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E
Ultraviolet
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Solution

The correct option is E Ultraviolet
On the incidence of blue light , no electron is emitted from metal , it means frequency of blue light is smaller than the threshold frequency of the metal . As out of all the given lights , Ultraviolet light has frequency greater than blue , therefore it might emit electrons from the metal.

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