A Laser Emits a Pulse of Light That Lasts 10 $10^{27}$

question 33

Multiple Choice

A laser emits a pulse of light that lasts 10 ns. The light has a wavelength of 690 nm, and each pulse has an energy of 480 mJ. How many photons are emitted in each pulse? (c = 3.0 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s)

• A) 1.7 × 10¹⁸
• B) 2.1 × \(10^{27}\)
• C) 2.6 × \(10^{37}\)
• D) 3.1 × \(10^{43}\)

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