Physics - Modern Physics Question with Solution | TestHub

A photoelectric material having work-function${\varphi }_0$is illuminated with a light of wavelength$\lambda \left(\lambda <\frac{hc}{{\varphi }_0}\right)$. The fastest photoelectron has a de Broglie wavelength${\lambda }_d$. A change in wavelength of the incident light by$\mathrm{\Delta }\lambda$results in a change$\mathrm{\Delta }{\lambda }_d$in${\lambda }_d$. The ratio$\frac{\mathrm{\Delta }{\lambda }_d}{\mathrm{\Delta }\lambda }$is proportional to