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Q.

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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a

12.4 eV

b

6.2 eV

c

100 eV

d

200 eV

answer is B.

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Detailed Solution

Maximum Kinetic EnergyKmax =  hce  1λ  − 1λ0 eV=12375  11000−12000  eV=6.2eV
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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