The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation the metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are

Options

A. None of these
B. A only
C. A and B only
D. All the three metals

Answer

C

Explanation

`phi(eV) = (12375)/(lamda(Å)) = (12375)/(4100) = 3.01 eV`
Hence, A and B only.