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Concepts Of Physics MCQ Edition [Volume 2]PhysicsElectromagnetic Waves

The speed of electromagnetic waves remains the same

Options

  1. Afor all intensities
  2. Bfor all frequencies
  3. Cfor all wavelengths
  4. Din all media

Correct answer

A. for all intensities

Step-by-step solution

The speed of electromagnetic waves in a material medium is given by v = c n , where n is the refractive index of the medium. Since the refractive index n of a dispersive medium depends on the wavelength (and frequency) of the wave, the speed of electromagnetic waves varies with both wavelength and frequency. The speed also changes depending on the nature of the medium. However, the speed of an electromagnetic wave is independent of its intensity (amplitude). Therefore, the speed of electromagnetic waves remains the

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