Question

When a light of wavelength 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

Medium

Solution

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Correct option is
B

1.78 eV

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