Question

The frequency and work function of an incident photon are v and ${\varphi }_0$. If $V_0$ is the threshold frequency the necessary condition for the emission of photoelectron is

• A. $v<v_0$
• B. $v=\frac{v_0}{2}$
• C. $v\ge v_0$
• D. None of these

Answer 1

The correct option is C $v\ge v_0$

Energy of incident radiation $E=h\nu$
Work function $\varphi =h{\nu }_0$
For ejection of photoelectron
$E\ge \varphi$
or
$\nu \ge {\nu }_0$