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The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einsteins equation, the metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are
(a) None
(b) A only
(c) A and B only
(d) All three metals
So, only metals having work function less than 3eV can emit photoelectrons for the incident radiation of wavelength 4100 Å.
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