Question

An electromagnetic wave passes through space and its equation is given by E = E₀ sin(ω - kx) where E is electric field. Energy density of electromagnetic wave in space is ______.

विकल्प

• `1/2epsilon_0"E"_0^2`

• `1/4epsilon_0"E"_0^2`

• `epsilon_0"E"_0^2`

• `2epsilon_0"E"_0^2`

Answer 1

An electromagnetic wave passes through space and its equation is given by E = E₀ sin(ω - kx) where E is electric field. Energy density of electromagnetic wave in space is `underlinebb(1/2epsilon_0"E"_0^2)`.

Explanation:

Energy density (EM waves)

= `epsilon_0"E"_"rms"^2`

= `epsilon_0("E"_0/sqrt2)^2`

= `1/2epsilon_0"E"_0^2`