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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The Answer of 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 ×

A Laser Emits a Pulse of Light That Lasts 10