The work functions for metals \( A, B \), and \( C \), respectively, are \( 1.92 \mathrm{eV}, 2....

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The work functions for metals \( A, B \), and \( C \), respectively, are \( 1.92 \mathrm{eV}, 2.0 \mathrm{eV} \), and \( 5.0 \mathrm{eV} \). According to Einstein's equation, the metals which will emit photoelectrons for a radiation of wavelength \( 4100 \AA \) is/are
(A) A only
(B) A and \( B \) only
(C) all the three metals
(D) none of these.
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