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Question

An electron beam and a proton beam have the same energy per particle. The wavelength associated with the electron beam is 24 A.The wavelength associated with the proton beam would approximately be

A
200 A
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B
10 A
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C
24 A
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D
0.5 A
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Solution

The correct option is B 0.5 A
De Broglie's wavelength λ=hmv=h2mE

For same energy E per particle λpλe=memp=11840

λp=λe142.89=2442.9=0.5590.5Ao.

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