Work functions of metals A, B and C are 1.92 eV, 2.0 eV and 5 eV. Which emit photoelectrons under light of wavelength 4100 Å?
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Work functions of metals A, B and C are 1.92 eV, 2.0 eV and 5 eV. Which emit photoelectrons under light of wavelength 4100 Å?

G1 Physics · Accepted Answer

Photon energy E = 1240/410 ≈ 3.02 eV. A (1.92 eV) and B (2.0 eV) satisfy E ≥ W, while C (5 eV) does not. Answer: C.