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Dual Nature of Radiation and Matter question

2007 · Q122
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Dual Nature of Radiation and Matter question

2007 · Q122

NEETPhysicsDual Nature of Radiation and MatterMCQ+4 / −1
Monochromatic light of frequency 6.0 ×\times× 1014 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 source per second is
  1. A
    5 ×1016\times {10^{16}}×1016
  2. B
    5 ×1017\times {10^{17}}×1017
  3. C
    5 ×1014\times {10^{14}}×1014
  4. D
    5 ×1015\times {10^{15}}×1015
View written solutionFree

Correct answer: D

Since p = nhν\nu ν

⇒\Rightarrow⇒ n = phν{p \over {h\nu }}hνp​ = 2×10−36.6×1034×6×1014{{2 \times {{10}^{ - 3}}} \over {6.6 \times {{10}^{34}} \times 6 \times {{10}^{14}}}}6.6×1034×6×10142×10−3​

= 5 ×1015 \times {10^{15}}×1015

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