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A Helium-Neon Laser Emits Light at 632 1.82×10171.82 \times 10^{17}

Question 23

Multiple Choice

A helium-neon laser emits light at 632.8 nm.If the laser emits 1.82×10171.82 \times 10^{17} photons/second,what is its power output in mW? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)


A) 57.2 mW
B) 28.6 mW
C) 37.2 mW
D) 45.7 mW

Correct Answer:

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