The kinetic energy of electrons is 10-20 J and the photons also have the same energy. The wavelengths associated with these particles are λe and λph respectively. These wavelengths are related in the following way
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a
λph=λe
b
λph<λe
c
λe/λph=c
d
λph>λe
answer is B.
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Detailed Solution
for photon λph=cv=hchv=hcEFor electron λe=hmv=h(2mE)λphλe=c2mE =3×1082×9×10−3110−20 or λphλe>1 or λph>λe