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Question
Light of wavelength 300 × 10−9m strikes a metal a metal surface with photoelectric work function of 2.13 eV. The kinetic energy of photoelectron is
Light of wavelength 300 × 10−9m strikes a metal a metal surface with photoelectric work function of 2.13 eV. The kinetic energy of photoelectron is
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Solution
The correct option is B 3.217 X 10-19 J
E = hcλ E0 = 2.13ev
= 6.625 × 10−34 × 1083 × 10−7 = 6.625 × 10−19 J
E0 = 2.13 × 1.6 × 10−19 = 3.408 × 10−19 J
K.E. = E − E0
= 6.625 × 10−19 − 3.408 × 10−19
= 3.217 × 10−19 J
3.217 X 10-19 J
E = hcλ E0 = 2.13ev
= 6.625 × 10−34 × 1083 × 10−7 = 6.625 × 10−19 J
E0 = 2.13 × 1.6 × 10−19 = 3.408 × 10−19 J
K.E. = E − E0
= 6.625 × 10−19 − 3.408 × 10−19
= 3.217 × 10−19 J
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