The electric vector vibration of an electromagnetic wave is given by E=(50 NC⁻1) sin ω(t-x/c). The intensity of the wave is

Options

(a) 2.3 Wm⁻²
(b) 4.3 Wm⁻²
(c) 3.3 Wm⁻²
(d) 1.8 Wm⁻²

Correct Answer:

3.3 Wm⁻²

Explanation:

The Intensity is, I = (1/2) ε₀E₀²c

I = (1/2) × (8.85 × 10⁻¹² N-m²C⁻²) × (50 NC⁻¹)² × 3 × 10⁸ ms⁻¹

I = 3.3 Wm⁻²