A Laser with a Power of 1

question 14

Multiple Choice

A laser with a power of 1.0 mW has a beam radius of 1.0 mm. What is the peak value of the electric field in that beam? (c = 3.0 x 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

• A) 490 V/m
• B) 840 V/m
• C) 65 V/m
• D) 120 V/m
• E) 22 V/m

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