Physics · 2022
JEE Main · 26 July 2022, Shift 1 · Q34
A parallel beam of light of wavelength 900 nm and intensity 100 Wm^-2 is incident on a surface perpendicular to the beam. The number of photons…
A parallel beam of light of wavelength $\displaystyle 900$ nm and intensity $\displaystyle 100 \mathrm{Wm}^{-2}$ is incident on a surface perpendicular to the beam. The number of photons crossing $\displaystyle 1 \mathrm{~cm}^2$ area perpendicular to the beam in one second is :
Official answer
(2)
$\displaystyle 4.5 \times 10^{16}$
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JEE Main 2022 Physics question, with the answer from NTA’s final answer key. Where our answers come from.