Physics · 2021
JEE Main · 17 March 2021, Shift 1 · Q18
An electron of mass m and a photon have same energy E. The ratio of wavelength of electron to that of photon is: (c being the velocity of light)
An electron of mass $\displaystyle m$ and a photon have same energy $\displaystyle E$. The ratio of wavelength of electron to that of photon is : (c being the velocity of light)
Official answer
(4)
$\displaystyle \frac{1}{c}\left(\frac{E}{2 m}\right)^{1 / 2}$
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.