Physics · 2022
JEE Main · 29 July 2022, Shift 1 · Q46
The kinetic energy of emitted electron is E when the light incident on the metal has wavelength λ. To double the kinetic energy, the incident light…
The kinetic energy of emitted electron is E when the light incident on the metal has wavelength $\displaystyle \lambda$. To double the kinetic energy, the incident light must have wavelength :
Official answer
(2)
$\displaystyle \frac{\mathrm{hc} \lambda}{\mathrm{E} \lambda+\mathrm{hc}}$
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JEE Main 2022 Physics question, with the answer from NTA’s final answer key. Where our answers come from.