A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and λ/2. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function at the surface of material is
A. \(\frac{\mathrm{hc}}{\lambda}\)
B. \(\frac{2 h c}{\lambda}\)
C. \(\frac{\mathrm{hc}}{3 \lambda}\)
D. \(\frac{\mathrm{hc}}{2 \lambda}\)
Answer:D
A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and λ/2. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function at the surface of material is
A. \(\frac{\mathrm{hc}}{\lambda}\) B. \(\frac{2 h c}{\lambda}\) C. \(\frac{\mathrm{hc}}{3 \lambda}\) D. \(\frac{\mathrm{hc}}{2 \lambda}\)