Answer: 3×10⁸ m/s.
- A 1×10⁸ m/s
- B 3×10⁶ m/s
- C 3×10⁸ m/s
- D 9×10⁸ m/s
Correct answer: C. 3×10⁸ m/s
Explanation: c = 1/√(μ₀ε₀) = 3×10⁸ m/s.
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.