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A Laser Emits a Pulse of Light That Lasts 10 102710^{27}

Question 71

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 × 102710^{27}
C) 2.6 × 103710^{37}
D) 3.1 × 104310^{43}

Correct Answer:

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