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Q.

The work function of a certain metal is 3.31 × 10–19 J. Then the maximum kinetic energy of photo-electrons emitted by incident radiation of wave length 5000A0 is (given h = 6.62×10–34 J -s, C=3×108ms–1, e = 1.6×10–19 coul.)

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a

2. 48 eV

b

0. 41 eV

c

2. 07 eV

d

0. 82 eV

answer is B.

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Detailed Solution

= 2.48eV – 2.07eV = 0.41eV

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The work function of a certain metal is 3.31 × 10–19 J. Then the maximum kinetic energy of photo-electrons emitted by incident radiation of wave length 5000A0 is (given h = 6.62×10–34 J -s, C=3×108ms–1, e = 1.6×10–19 coul.)