If a 20 W Laser Beam, Which Has an Initial

question 77

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 × 10⁻⁴ W/m²
• B) 20 × 10⁻⁶ W/m²
• C) 20 × 10⁻⁸ W/m²
• D) 6.4 W/m²
• E) 6.4 × 10⁻⁶ W/m²

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