A Helium-Neon Laser Emits Light of Wavelength 632

question 3

Multiple Choice

A helium-neon laser emits light of wavelength 632.8 nm and has a power output of 1.5 mW. How many photons are emitted per second by this laser?

• A) 1.34 × 10¹⁴
• B) 2.56 × 10¹⁵
• C) 3.09 × 10¹⁵
• D) 4.22 × 10¹⁵
• E) 4.78 × 10¹⁵

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