Question

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

• A. $2\times {10}^{-2}$
• B. $\sqrt{3}$
• C. $\frac{W}{3}$
• D. $\frac{W}{\sqrt{3}}$

Answer 1

Answer: (B)

The photoelectric effect is an instantaneous phenomenon (experimentally proved). It takes approximate, time of the order of $\frac{n_1}{n_2}=\frac{l_2}{l_1}=\frac{49}{50}$ .