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A proton has kinetic energy E = 100 keV ...

A proton has kinetic energy E = 100 keV which is equal to that of a photon. The wavelength of photon is `lamda_(2)` and that of proton is `lamda_(1)`. The ratio of `lamda_(2)//lamda_(1)` is proportional to

A

`E^(2)`

B

`E^(1//2)`

C

`E^(-1)`

D

`E^(-1//2)`

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