A Light Beam from a 2

question 6

Multiple Choice

A light beam from a 2.1-mW He-Ne laser has a wavelength of 633 nm.How many photons does the laser emit in one second? (h = 6.626 × 10^-34 J • s,c = 3.00 × 10⁸ m/s)

• A) 6.7 × 10¹⁵
• B) 8.8 × 10¹⁵
• C) 1.1 × 10¹⁶
• D) 1.3 × 10¹⁶

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