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An electron and a photon have the same d...

An electron and a photon have the same de Broglie wavelength. Which one of these has higher kinetic energy?

Text Solution

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As `lambda=h/p` if `lambda_1=lambda_2` , then `p_1=p_2`
Now `E_e=p^2/(2M_e)` and `E_p=p^2/(2M_p)`
As `M_p gt M_e rArr E_e gt E_p`
hence, kinetic energy of electron is more than that of proton.
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