Physics - Modern Physics Question with Solution | TestHub

For photoelectric emission to take place, the energy of the incident photon must be greater than or equal to the work function of the metal.

$E\ge \Phi$

$\frac{hc}{\lambda }\ge \frac{hc}{{\lambda }_0}$

$\lambda \le {\lambda }_0$

From the given options, the condition is satisfied by $\lambda <{\lambda }_0$.

Answer: $\lambda <{\lambda }_0$