A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and \(\frac { λ }{ 2 }\) . 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. \(\frac { hc }{ λ }\)
B. \(\frac { 2hc }{ λ }\)
C. \(\frac { hc }{ 3λ }\)
D. \(\frac { hc }{ 2λ }\)
Answer:D
A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and \(\frac { λ }{ 2 }\) . 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. \(\frac { hc }{ λ }\) B. \(\frac { 2hc }{ λ }\) C. \(\frac { hc }{ 3λ }\) D. \(\frac { hc }{ 2λ }\)