The maximum wavelength of light that can be used to produce photoelectric effect on a metal is 250 nm. The maximum kinetic energy of the electrons in joule, emitted from the surface of the metal when a beam of light of wavelength 200 nm is used :
A
89.61×10−22
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B
69.81×10−22
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C
18.96×10−20
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D
19.86×10−20
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Solution
The correct option is D19.86×10−20 K.E.max=hcλ−hcλT