Answer: (1/2)cε₀E₀².
- A (1/2)cε₀E₀²
- B cε₀E₀²
- C (1/2)ε₀E₀²
- D cE₀²
Correct answer: A. (1/2)cε₀E₀²
Explanation: Average intensity I = (1/2)cε₀E₀².
In an electromagnetic wave, the oscillating electric field (E) and magnetic field (B) are perpendicular to each other and to the direction the wave travels - a purely transverse wave that needs no medium, unlike sound.
Concept context
Maxwell's equations, EM spectrum, properties, and applications of each band.