Physics · 2022
JEE Main · 25 July 2022, Shift 1 · Q47
A metal exposed to light of wavelength 800 nm and and emits photoelectrons with a certain kinetic energy. The maximum kinetic energy of…
A metal exposed to light of wavelength $\displaystyle 800$ nm and and emits photoelectrons with a certain kinetic energy. The maximum kinetic energy of photo-electron doubles when light of wavelength $\displaystyle 500$ nm is used. The workfunction of the metal is : (Take $\displaystyle \mathrm{hc}=1230 \mathrm{eV}-\mathrm{nm}$ ).
Official answer
(3)
0.$\displaystyle 615$ eV
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JEE Main 2022 Physics question, with the answer from NTA’s final answer key. Where our answers come from.