Helium-Neon Laser Light Has a Wavelength in Air of 632

question 27

Multiple Choice

Helium-neon laser light has a wavelength in air of 632.8 nm.What is the energy of a single photon in the beam? (h = 6.626 × 10−³⁴ J⋅s and c = 3.00 × 10⁸ m/s) .

• A)3.14 × 10−¹⁹ J
• B)5.40 × 10−¹⁹ J
• C)7.62 × 10−¹⁹ J
• D)1.15 × 10−¹⁸ J

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