Question

As kinetic energy $\left(K_{\max }\right)$ is always positive, so

• A. $hv={\varphi }_0$
• B. $hv>{\varphi }_0$
• C. $hv<{\varphi }_0$
• D. None of these

Answer 1

Answer: (B)

We know that, $K_{\max }=hv-{\varphi }_0$
and hence if $K_{\max }>0$
$hv-{\varphi }_0>0$
or $hv>{\varphi }_0$