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The de-Broglie wavelength of an electron...

The de-Broglie wavelength of an electron moving with a velocity `1.5 xx 10^(8)ms^(-1)` is equal to that of a photon. The ratio of the kinetic energy of the electron to that of the photon is:

A

2

B

4

C

`1/2`

D

`1/4`

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