Physics · 2026
JEE Main · 8 April 2026, Shift 2 · Q43
K_1 and K_2 be the maximum kinetic energies of photoelectrons emitted from a surface of a given material for the light of wavelength λ_1 and λ_2,…
$\displaystyle K_1$ and $\displaystyle K_2$ be the maximum kinetic energies of photoelectrons emitted from a surface of a given material for the light of wavelength $\displaystyle \lambda_1$ and $\displaystyle \lambda_2$, respectively. If $\displaystyle \lambda_1=2 \lambda_2$ then the work function of material is given by :
Official answer
From NTA’s final answer key for this paper.
(4)
$\displaystyle K_2-2 K_1$
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JEE Main 2026 Physics question, with the answer from NTA’s final answer key. Where our answers come from.