Question

The time taken by a photoelectron to come out after the photon strikes is approximately :

• A. $10^{-4}s$
• B. $10^{-10}s$
• C. $10^{-16}s$
• D. $10^{-1}s$

Answer 1

Answer: (B)

The photoelectric effect is an instantaneous phenomenon (experimentally proved). It takes approx, time of the order of $10^{10}s$.