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

Question 35

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 initial intensity of the beam?


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

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