Answer: 3 × 10⁸ m/s (same for all EM waves).
- A 3 × 10⁸ m/s (same for all EM waves)
- B 3 × 10⁸ m/s mainly for light in most cases
- C Depends on the frequency under typical conditions
- D Depends on the wavelength according to standard textbooks
Correct answer: A. 3 × 10⁸ m/s (same for all EM waves)
Explanation: All electromagnetic waves travel at c = 3 × 10⁸ m/s in vacuum, regardless of their frequency or wavelength. This is a fundamental constant of nature.
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.