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NEET 2007
Exam
NEET
Year
2007
Subject
Physics
Chapter
Dual Nature of Matter

NEET 2007 · Physics · Dual Nature of Matter

Monochromatic light of frequency 6.0 × 10^ 14 ~Hz is produced by a...

Monochromatic light of frequency 6.0×6.0 \times 1014 Hz10^{14} \mathrm{~Hz} is produced by a laser. The power emitted is 2×10−3 W2 \times 10^{-3} \mathrm{~W}. The number of photons emitted, on the average, by the source per second is:

Options

  1. A5×10165 \times 10^{16}
  2. B5×10175 \times 10^{17}
  3. C5×10145 \times 10^{14}
  4. D5×10155 \times 10^{15}

Correct answer

D. 5×10155 \times 10^{15}

Step-by-step solution

η=pmv=2×10−36.62×10−34×6×1014\eta=\frac{p}{m v}=\frac{2 \times 10^{-3}}{6.62 \times 10^{-34} \times 6 \times 10^{14}} =5×1015=5 \times 10^{15}
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