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A 20 W Laser Beam, with an Initial Diameter of 2.0

Question 72

Multiple Choice

A 20 W laser beam, with an initial diameter of 2.0 mm, spreads out to a diameter of 2.0 m after traveling 10,000 m. What is the initial intensity of the beam?


A) 20 × 106 W/m2
B) 6.4 × 106 W/m2
C) 3.2 × 106 W/m2
D) 2.0 × 105 W/m2
E) 1.0 × 105 W/m2

Correct Answer:

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