Dual Nature of Radiation and Matter - Result Question 44
46. Monochromatic light of frequency $6.0 \times 10^{14} Hz$ is produced by a laser. The power emitted is $2 \times 10^{-3} W$. The number of photons emitted, on the average, by the sources per second is
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======= ####46. Monochromatic light of frequency $6.0 \times 10^{14} Hz$ is produced by a laser. The power emitted is $2 \times 10^{-3} W$. The number of photons emitted, on the average, by the sources per second is
c3eec34ec6b1fad69db54a20ad4b2dca40c2aa54 (a) $5 \times 10^{16}$
(c) $5 \times 10^{14}$
(b) $5 \times 10^{17}$
(d) $5 \times 10^{15}$
[2007]
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Answer:
Correct Answer: 46. (d)
Solution:
- (d) Since $p=n h v$
$ \Rightarrow n=\frac{p}{h v}=\frac{2 \times 10^{-3}}{6.6 \times 10^{-34} \times 6 \times 10^{14}}=5 \times 10^{15} $
