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

A Greater than 10-5 s
B Between 10-5 s and 10-9 s
C Less than 10-9 s
D 1 second

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.
Bissoy MCQ
#Engineering Physics #Photoelectric Effect

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