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If a 20 W Laser Beam,which Has an Initial Diameter $\times$

Question 72

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 $\times$ 10^-4 W/m²
B) 20 $\times$ 10^-6 W/m²
C) 20 $\times$ 10^-8 W/m²
D) 6.4 W/m²
E) 6.4 $\times$ 10^-6 W/m²

If a 20 W Laser Beam,which Has an Initial Diameter ×\times×

Multiple Choice

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If a 20 W Laser Beam,which Has an Initial Diameter $\times$

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