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What is the time lag between the incidence of photons and the ejection of photoelectrons?

What is the time lag between the incidence of photons and the ejection of photoelectrons? Correct Answer Less than 10-9 s

The laws of photoelectric emission states that it is an instantaneous process because the photoelectric emission occurs due to the elastic collision between a photon and an electron. Practically, there is no time lag (< 10-9 s) between the incident photon and emission of an electron.

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