Chemistry · 2021
JEE Main · 4 August 2021, Shift 2 · Q53
The number of photons emitted by a 800 nm lamp having an average power of 5 mW in 10 s is \ \ \ \ × 10^17. (Nearest integer) [Given: h =6.626 ×…
The number of photons emitted by a $\displaystyle 800$ nm lamp having an average power of $\displaystyle 5$ mW in $\displaystyle 10$ s is \_\_\_\_ $\displaystyle \times 10^{17}$.
(Nearest integer)
[Given : $\displaystyle \mathrm{h}=6.626 \times 10^{-34} \mathrm{Js} ; \mathrm{C}=3.0 \times 10^8 \mathrm{~ms}^{-1}$ ]
Official answer
2
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JEE Main 2021 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.