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The maximum wave length of radiation that can produce Photoelectric effect in a certain metal is 200 nm. The maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm will be

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12.4 eV

6.2 eV

100 eV

200 eV

answer is B.

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Detailed Solution

Maximum Kinetic Energy

$K_{\max} = \frac{hc}{e} [\frac{1}{λ} - \frac{1}{λ_{0}}] eV = 12375 (\frac{1}{1000} - \frac{1}{2000}) eV = 6 .2 e V$

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