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

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

AIEEEAIEEE 2006Dual Nature of Radiation and Matter

Solution:

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