Physics · 2022
JEE Main · 26 June 2022, Shift 1 · Q47
An electron with speed v and a photon with speed c have the same de-Broglie wavelength. If the kinetic energy and momentum of electron are E_e and…
An electron with speed $\displaystyle v$ and a photon with speed c have the same de-Broglie wavelength. If the kinetic energy and momentum of electron are $\displaystyle \mathrm{E}_{\mathrm{e}}$ and $\displaystyle \mathrm{p}_{\mathrm{e}}$ and that of photon are $\displaystyle \mathrm{E}_{\mathrm{ph}}$ and $\displaystyle \mathrm{p}_{\mathrm{ph}}$ respectively. Which of the following is correct ?
Official answer
(2)
$\displaystyle \frac{\mathrm{E}_{\mathrm{e}}}{\mathrm{E}_{\mathrm{ph}}}=\frac{v}{2 \mathrm{c}}$
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JEE Main 2022 Physics question, with the answer from NTA’s final answer key. Where our answers come from.