Question

Why electrons are not emmited when the energy is below threshold frequency?

Answer 1

Answer:

Trapped in the metal are many electrons, each of which requires a certain amount of energy to be freed. Because the energy of each photon in the beam is determined by the frequency of the beam, this means that there is a threshold frequency below which no electrons will be emitted when light shines on the metal.

Explanation:

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Answer 2

Answer:

because the electron is strongly attracted by the nucleus , that's why it needs the required energy