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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