Determine the amount of energy carried in 50 m of a 3.5-mW He-Ne laser beam if the cross-sectional area of the beam is 5.0 *10-6 m2.
A) 2.9 * 10-8 J
B) 5.8 *10-10 J
C) 0.024 J
D) 2.9 * 10-10 J
Correct Answer:
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