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Question
When a light of wavelength $$\lambda $$ and photon energy 2ev fall on a metal surface electrons are emitted with maximum speed V. if the wavelength is decreased by 25 % the maximum speed of electron become 2V. the work function is
A
24 eV
B
1.78 eV
C
4.2 eV
D
3.6 eV
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Solution
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Correct option is B. 1.78 eV
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