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Question

A metal plate is illuminated with light of a certain frequency. Which of the following determine whether or not electrons are ejected?

A
How long the plate is exposed to the light.
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B
The area of the plate.
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C
The intensity of the light.
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D
The material of which the plate is made.
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Solution

The correct option is D The material of which the plate is made.
Whether or not electrons are emitted will depend on the threshold frequency of the material. If the incident light is of a higher frequency than the threshold frequency, then the electrons will be emitted.

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