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(B) In the photoelectric effect,the emission of electrons from a metal surface depends on the energy of the incident photons. According to Einstein's

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frequency

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(B) In the photoelectric effect,the emission of electrons from a metal surface depends on the energy of the incident photons. According to Einstein's photoelectric equation,the energy of an incident photon is given by $E = h
u$. For the emission of electrons to occur,the incident frequency $
u$ must be greater than or equal to the threshold frequency $
u_0$ of the metal. If $
u Therefore,a minimum threshold frequency is required for the photoelectric effect to take place.

In the photoelectric effect,electrons are emitted from a metal surface only when the incident light has a certain minimum . . . . . . .

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