Field Intensity: a 7

question 43

Multiple Choice

Field intensity: A 7.5 × 10¹⁴ Hz laser emits a 7.7-μs pulse, 5.0 mm in diameter, with a beam energy density of 0.51 J/m³. What is the amplitude of the electric field of the emitted waves? (c = 3.00 × 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

• A) 340 kV/m
• B) 480 kV/m
• C) 240 kV/m
• D) 150 kV/m
• E) 120 kV/m

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