A plane electromagnetic wave propagating in x-direction is described by Eᵧ = (200 V m⁻¹) sin[1.5 × 10⁷t – 0.05x] ; The intensity of the wave is : (Use ε₀ = 8.85 × 10⁻¹² C²N⁻¹m⁻²)
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Question

A plane electromagnetic wave propagating in x-direction is described by Eᵧ = (200 V m⁻¹) sin[1.5 × 10⁷t – 0.05x] ; The intensity of the wave is : (Use ε₀ = 8.85 × 10⁻¹² C²N⁻¹m⁻²)

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G1 Physics · Accepted Answer

Intensity of an electromagnetic wave is I = ½ ε₀E₀²c Here, E₀ = 200 V/m Therefore, I = ½ × 8.85 × 10⁻¹² × (200)² × 3 × 10⁸ I = 53.1 W/m² Correct option: B.