Multiple Choice
Determine the amount of energy carried in 1.1 m of a 4.2-mW He-Ne laser beam if the cross-sectional area of the beam is 2.6 × 10−6 m2.
A) 6.5E-11 J
B) 2.5E-12 J
C) 1.5E-11 J
D) 1.7E-8 J
E) 5.1E-12 J
Correct Answer:
Verified
Correct Answer:
Verified
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