A Helium-Neon Laser Emits Red Light Having a Wavelength of 6.4

question 11

Multiple Choice

A helium-neon laser emits red light having a wavelength of 6.4 × 10−⁷ m and a power of 0.5 mW. How many photons are emitted each second?

• A) 6.4 × 10³⁸
• B) 1.6 × 10²¹
• C) 3.2 × 10²⁵
• D) 2.6 × 10¹⁸
• E) 1.6 × 10¹⁵

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