Question

Light of wavelength $\lambda$ falls on metal having work function hc/$\lambda$0. Photoelectric effect will take place only if :

• A. $\lambda\lambda_{0}$
• B. $\lambda 2\lambda_{0}$
• C. $\lambda\lambda_{0}$
• D. $\lambda\lambda_{0}/2$

Answer 1

Answer: (C)

$\lambda\lambda_{0}$

Answer 2

For photoelectric effect to take place,

${E_{l}}_{ight}W\therefore\frac{hc}{\lambda} \geq \frac{hc}{\lambda_{0}}or\lambda \leq \lambda_{0}$.