Q 2540734613.     The de-Broglie wavelength of an electron is the same as that of a `50 keV` X-ray photon. The ratio of the energy of the photon to the kinetic energy of the electron is (the energy equivalent of electron mass is `0.5 MeV`)

WBJEE 2014
A

`1:50`

B

`1:20`

C

`20:1`

D

`50:1`

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