Multiple Choice
A 5-mW laser pointer has a beam diameter of 3 mm.What is the total electromagnetic energy in a 2.0 m length of this laser beam?
A) 2.3 * 10-16 J
B) 4.7 * 10-16 J
C) 1.7 * 10-11 J
D) 3.3 * 10-11 J
E) 5.0 * 10-3 J
Correct Answer:
Verified
Correct Answer:
Verified
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