MCQ
A photoelectric material having work-function $\phi_0$ is illuminated with light of wavelength $\lambda\left(\lambda<\frac{\mathrm{hc}}{\phi_0}\right)$. The fastest photoelectron has a de Broglie wavelength $\lambda_d$. A change in wavelength of the incident light by $\Delta \lambda$ results in change $\Delta \lambda_{\mathrm{d}}$ in $\lambda_{\mathrm{d}}$. then the ratio $\Delta \lambda_{\mathrm{d}} / \Delta \lambda$ is proportional to
- A$\lambda_d / \lambda$
- B$\lambda_{\mathrm{d}}^2 / \lambda$
- C$\lambda_d^3 / \lambda$
- ✓$\lambda_{\mathrm{d}}^3 / \lambda^2$
