A 20 W Laser Beam, with an Initial Diameter of 2.0

question 29

Multiple Choice

A 20 W laser beam, with 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 E_rms of the beam?

• A) 4.9 × 10⁴ V/m
• B) 2.5 × 10³ V/m
• C) 1.2 × 10³ V/m
• D) 1.9 × 10² V/m
• E) 1.7 × 10² V/m

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