Assertion A: In the photoelectric effect, the electrons are ejected from the metal surface as soon as the beam of light of frequency greater than threshold frequency strikes the surface.

Reason R: Wh

Question

Assertion A: In the photoelectric effect, the electrons are ejected from the metal surface as soon as the beam of light of frequency greater than threshold frequency strikes the surface.

Reason R: When the photon of any energy strikes an electron in the atom, transfer of energy from the photon to the electron takes place.

Choose the most appropriate answer:

Canvas Classes · Accepted Answer

Assertion A is correct — photoelectric emission is instantaneous when ; there is no time delay.

Reason R is incorrect — a photon transfers energy to an electron only if its energy equals or exceeds the work function (). A photon of any energy does NOT necessarily cause ejection; the frequency must exceed the threshold. The statement "photon of any energy" is wrong.

Answer: Option (2) — A is correct but R is not correct

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