Question

Photoelectric current in an experimental study of photoelectric effect is made zero by making anode negative with respect to cathode. If stopping potential is $V_{0}$, then

• A. kinetic energy of emitted photoelectron is $K=e V_{0}$
• B. for every emitted photoelectron kinetic energy $K \geq eV$
• C. maximum kinetic energy of emitted electrons $ K_{\max }=e V_{0} $
• D. sum of kinetic energies of emitted photoelectrons is $\Sigma K=e V_{0}$

Answer 1

Answer: (C)

Photoelectric current is zero when the stopping potential is sufficient to repel even the most energetic photoelectrons, with the maximum kinetic energy $\left(K_{\max }\right)$, so that $K_{\max }=e V_{0}$