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NEET2013PhysicsElectromagnetic WavesActual

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

Options

  1. AWavelength is double and frequency become half.
  2. BWavelength is halved and frequency remains unchanged.
  3. CWavelength and frequency both remain unchanged.
  4. DWavelength is doubled and frequency unchanged.

Correct answer

B. Wavelength is halved and frequency remains unchanged.

Step-by-step solution

Velocity of electromagnetic wave in vacuum. C= 1 ₀ ₀ =V_ vacum Velocity of electromagnetic wave in medium V_ m e d = 1 ₀ ₀ ₀ c_ n r = C _r _r ₀ and ₀ is in vacuum and r ₀ is in medium. For dielectric medium r=1 aligned & V_ med = C _r Given ₀=4 & V_ med = C 4 = C 2 aligned Wavelength of the wave in medium _ med = V_ med V = C 2 V = _ vacum 2

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