Physics · 2009
NEET 2009 · Prelims · Code A · Q40
Monochromatic light of wavelength 667 n m is produced by a helium neon laser. The power emitted is 9 m W. The number of photons arriving per sec. on…
Monochromatic light of wavelength $\displaystyle 667 n m$ is produced by a helium neon laser. The power emitted is $\displaystyle 9 m W$. The number of photons arriving per sec. on the average at a target irradiated by this beam is :
Official answer
(3)
$\displaystyle 3 \times 10^{16}$
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NEET (UG) 2009 Physics question, with the answer from NTA’s final answer key. Where our answers come from.