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

question 42

Multiple Choice

A helium-neon laser emits light at 632.8 nm. If the laser emits $1.82 \times 10 ^ { 17 }$ 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

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