Question

If the work function of a metal is ${\varphi }_0$,then its threshold wavelength will be

• A. $hc{\varphi }_0$
• B. $\frac{c{\varphi }_0}{h}$
• C. $\frac{h{\varphi }_0}{c}$
• D. $\frac{hc}{{\varphi }_0}$

Answer 1

Answer: (D)

$\frac{hc}{{\varphi }_0}$

Work function ${\varphi }_0=\frac{hc}{{\lambda }_0}$
$\Rightarrow {\lambda }_0=\frac{hc}{{\varphi }_0}$