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The threshold frequency is the frequency below which

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The threshold frequency is the frequency below which :

Answer & Solution
Correct Answer: Option C
The photoelectric effect is the emission of electrons by substances, especially metals, when light falls on their surfaces. The photoelectric effect will not occur when the frequency of the incident light is less than the threshold frequency as the electrons are unable to gain sufficient energy to overcome the electrostatic barrier of the work function of the metal.
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