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The work function 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 photo electrons for a radiation of wavelength 4100 Å is/are

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A only

A and B only

All the three metals

None of these

answer is C.

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Detailed Solution

$E n e r g y o f i n c i d e n t r a d i a t i o n s (i n e V) = \frac{12375}{4100} = 3.01 e V W o r k f u n c t i o n o f m e t a l A a n d B a r e l e s s t h a n 3.01 e V, S o, A a n d B w i l l e m i t p h o t o e l e c t r o n s .$

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