A Laser Emits a Pulse of Light That Lasts 10

question 72

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 ×
• C)2.6 ×
• D)3.1 ×

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