Q.

Work function of nickel is 5.01 eV. When ultraviolet radiation of wavelength 200 Ao is incident on it, electrons are emitted. What will be the maximum velocity of emitted electrons?

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a

3×108ms−1

b

6.46×105ms−1

c

10.36×105ms−1

d

8.54×106ms−1

answer is B.

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Detailed Solution

Energy corresponding to 2000Å=12375/2000eV=6.2eVE=W+KEMaximum kinetic energy is(6.2−5.01)eV=1.19eV Now,  12×9.1×10−31×vmax2=1.19×1.6×10−19 or  vmax2=1.19×1.6×10−19×29.1×10−31 =0.418×1012=41.8×1010 or vmax=6.46×105ms−1
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