Answer: c.
- A c
- B 1/c
- C c²
- D 1
Correct answer: A. c
Explanation: For an EM wave in vacuum, E₀/B₀ = c.
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.