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Question

A proton has kinetic energy E=100keV which is equal to that of a photon. The wavelength of photon is λ2 and that of proton is λ1. The ratio of λ1/λ2 is proportional to

A
E2
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B
E1/2
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C
E1
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D
E1/2
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Solution

The correct option is B E1/2
For proton and photon wavelength is given as λproton=h2mE
λphoton=hcE
the ratio of λ1λ2E1/2

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