Question: 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

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? Multiple Choice 20 104 W/m2 20 106 W/m2 20 108 W/m2 6.4 W/m2 6.4 106 W/m2

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