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If a 20 W Laser Beam, Which Has an Initial

Question 77

Multiple Choice

If a 20 W laser beam, which has an initial diameter of 2.0 mm, spreads out to a diameter of 2.0 m after traveling 10,000 m, what is the final intensity of the beam?


A) 20 × 10−4 W/m2
B) 20 × 10−6 W/m2
C) 20 × 10−8 W/m2
D) 6.4 W/m2
E) 6.4 × 10−6 W/m2

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