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
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