Question

If the work function of a metal is ${}^{\prime }{\varphi }^{\prime }$ and the frequency of the incident light is 'v', there is no emission of photoelectron if

• A. $v<\frac{\varphi }{h}$
• B. $v=\frac{\varphi }{h}$
• C. $v>\frac{\varphi }{h}$
• D. $v>=<\frac{\varphi }{h}$

Answer 1

The correct option is A

$v<\frac{\varphi }{h}$

For no emission of photoelectron, energy of incident light < Work function $\Rightarrow hv<\varphi \Rightarrow v<\frac{\varphi }{h}$