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An electromagnetic wave of frequency v=3.0 MHz passes from vacuum into a dielectric medium with permittivity =4.0 . Then

Options

  1. Awavelength is doubled and the frequency remains unchanged
  2. Bwavelength is doubled and frequency becomes half
  3. Cwavelength is halved and frequency remains unchanged
  4. Dwavelength and frequency both remain unchanged.

Correct answer

C. wavelength is halved and frequency remains unchanged

Step-by-step solution

Refractive index, = ₀ =2 Speed and wavelength of wave will becomes half, the frequency remaining unchanged (frequency of a wave depends on the source as due to refraction, it is assumed that the energy is conserved. hv remains the same)

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