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Dual Nature of Radiation and Matter question

2009 · Q145
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Dual Nature of Radiation and Matter question

2009 · Q145

NEETPhysicsDual Nature of Radiation and MatterMCQ+4 / −1
Monochromatic light of wavelength 667 nm is produced by a helium neon laser. The power emitted is 9 mW. The number of photons arriving per sec. on the average at a target irradiated by this beam is
  1. A
    3 ×\times× 1016
  2. B
    9×10159 \times {10^{15}}9×1015
  3. C
    3×10193 \times {10^{19}}3×1019
  4. D
    9×10179 \times {10^{17}}9×1017
View written solutionFree

Correct answer: A

Number of photons = Ehcλ{E \over {{{hc} \over \lambda }}}λhc​E​

= 9×10−3×6.67×10−76.6×10−34×3×108{{9 \times {{10}^{ - 3}} \times 6.67 \times {{10}^{ - 7}}} \over {6.6 \times {{10}^{ - 34}} \times 3 \times {{10}^8}}}6.6×10−34×3×1089×10−3×6.67×10−7​

= 3 ×\times× 1016

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