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Question

When I shine dim green light on a metal surface, no electrons are ejected.
Which of the following changes might cause electrons to be ejected from the surface?

A
Shining bright green light on the metal surface
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B
Shining dim red light on the metal surface
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C
Shining dim purple light on the surface
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D
Shining bright red light on the metal surface
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E
Shining green light more directly on the metal surface
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Solution

The correct option is A Shining bright green light on the metal surface

This is based on the photoelectric effect. More the intensity of the incident light(brighter the green light) more the no. of photo-electrons emitted . Dim light have low intensity such that it could not eject electrons from the metal surface.

Moreover using bright red light would have no effect. Because no. of photo-electrons emitted is independent of frequency and depends only on intensity of the light.


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