Question 335: Dual Nature of Matter and Radiation

Question

A metal surface of work function $$1 \cdot 13 \mathrm{~eV}$$ is irradiated with light of wavelength $$310 \mathrm{~nm}$$. The retarding potential required to stop the escape of photoelectrons is [Take $$\frac{\mathrm{hc}}{\mathrm{e}}=1240 	imes 10^{-9} \mathrm{SI}$$ units]

Accepted Answer

Energy of incident light:
$$\begin{aligned}
E & =\frac{h c}{\mathrm{e} \lambda} \
& =\frac{1240 	imes 10^{-9}}{310 	imes 10^{-9}} \
& =4 \mathrm{~ev}
\end{aligned}$$
Stopping potential $$\mathrm{V}_0=\frac{\mathrm{hc}}{\mathrm{e} \lambda}-\frac{\phi_0}{\mathrm{e}}$$
$$\mathrm{V}_0=4-1.13=2.87 \mathrm{~V}$$

Answer

1.13 V

Answer

2.87 V

Answer

3.97 V

Answer

4.23 V

Dual Nature of Matter and Radiation

A metal surface of work function $1 \cdot 13 \mathrm{~eV} is irradiated with light of wavelength 310 \mathrm{~nm}. The retarding potential required to stop the escape of photoelectrons is [Take \frac{\mathrm{hc}}{\mathrm{e}}=1240 \times 10^{-9} \mathrm{SI}$ units]

Choose the correct answer: