Q.

The de Broglie wavelengths for an electron and a photon are λe and λp respectively. For the same kinetic energy of electron and photon, which of the following presents the correct relation between the de Broglie wavelengths of two?

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a

λpλe2

b

λpλe

c

λpλe

d

λp1λe

answer is A.

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p22m=hCλpλe=hpλe2 λp

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