Question 101: Dual Nature of Matter and Radiation

Question

The work function of a substance is $$3.0 \mathrm{~eV}$$. The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately;

Accepted Answer

$$\begin{aligned}
& 	ext { For P.E.E. : } \lambda \leq \frac{h c}{W_e} \
& \lambda \leq \frac{1240 \mathrm{~nm}-\mathrm{eV}}{3 \mathrm{eV}} \
& \lambda \leq 413.33 \mathrm{~nm} \
& \lambda_{\max } \approx 414 \mathrm{~nm} 	ext { for P.E.E. }
\end{aligned}$$

Answer

215 nm

Answer

400 nm

Answer

414 nm

Answer

200 nm

Dual Nature of Matter and Radiation

The work function of a substance is $3.0 \mathrm{~eV}$. The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately;

Choose the correct answer: