A laser emits light of wavelength 463 nm during a brief pulse that lasts for 25 ms and has a total energy of 1.2 J.How many photons are emitted in that single pulse? (c = 3.00 × 108 m/s,
H = 6.626 × 10-34 J • s)
A) 2.8 × 1018
B) 6.9 × 1019
C) 3.4 × 1019
D) 1.1 × 1017
E) 2.2 × 1017
Correct Answer:
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