The rms value of the electric field of the light coming from the sun is 720 N/C. The average total energy density of the electromagnetic wave is:
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Question

The rms value of the electric field of the light coming from the sun is 720 N/C. The average total energy density of the electromagnetic wave is:

G1 Physics · Accepted Answer

For rms electric field, average total energy density is u=ε₀Eᵣₘₛ². Thus u=(8.85×10⁻¹²)(720)²≈4.58×10⁻⁶ J m⁻³. Hence option A.