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

Question 38

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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