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(C) The photoelectric effect is defined as the phenomenon in which electrons are emitted from the surface of a metal when light of a suitable frequenc

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Light of suitable wavelength falls on it

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(C) The photoelectric effect is defined as the phenomenon in which electrons are emitted from the surface of a metal when light of a suitable frequency (or wavelength) strikes it. For emission to occur,the incident light must have a frequency greater than or equal to the threshold frequency $(
u_0)$,which corresponds to a wavelength less than or equal to the threshold wavelength $(\lambda_0)$.

The photoelectric effect is described as the ejection of electrons from the surface of a metal when :

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