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NEET 2009
Exam
NEET
Year
2009
Subject
Physics
Chapter
Dual Nature of Matter

NEET 2009 · Physics · Dual Nature of Matter

Monochromatic light of wavelength 667 ~nm is produced by a helium...

Monochromatic light of wavelength 667 nm667 \mathrm{~nm} is produced by a helium neon laser. The power emitted is 9 mW9 \mathrm{~mW}. The number of photons arriving per second on the average at a target irradiated by this beam is :

Options

  1. A3×10193 \times 10^{19}
  2. B9×10179 \times 10^{17}
  3. C3×10163 \times 10^{16}
  4. D9×10159 \times 10^{15}

Correct answer

C. 3×10163 \times 10^{16}

Step-by-step solution

 No. of photons =E(hc/λ)=9×10−3×6.67×10−76.6×10−34×3×108=3×1016\begin{array}{r} \text{ No. of photons }=\frac{E}{(\mathrm{hc} / \lambda)} \\ =\frac{9 \times 10^{-3} \times 6.67 \times 10^{-7}}{6.6 \times 10^{-34} \times 3 \times 10^8} \\ =3 \times 10^{16} \end{array}
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