Two identical metal surfaces with work function are illuminated separately by two…
PHYSICS · Single correct · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter
Problem
Two identical metal surfaces with work function 2.8eV are illuminated separately by two monochromatic beams that deliver the same photon flux (photons per second).
• Light A: wavelength 460nm
• Light B: wavelength 380nm
Which statement best describes the photoelectric currents that will be observed?
(a) Both lights produce photoelectric currents of equal magnitude because the photon flux is the same.
(b) Only Light A produces a photoelectric current because its wavelength is longer.
(c) Only Light B produces a photoelectric current because its photons have enough energy to overcome the work function.
(d) Neither light produces a photoelectric current because the photon energies are insufficient to eject electrons.