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Q.

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 Ao are

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a

none

b

A only

c

A and B only

d

all the three medals

answer is C.

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Detailed Solution

Work function for wavelength of 4100 Ao isW=hcλ=6.62×10−34×3×1084100×10−10=4.8×10−19J=4.8×10−191.6×10−19eV=3eVNow,  we  have  WA=1.92eV,   WB=2.0eV,  WC=5eV  since  WA
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