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The de Broglie wavelength of an electron...

The de Broglie wavelength of an electron moving with a velocity c/2 (c =velocity of light in vacuum) is equal to the wavelength of a photon. The ratio of the kinetic energies of electron and photon is

A

`1:4`

B

`1:2`

C

`1:1`

D

`2:1`

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