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Electromagnetic Waves and Light Properties

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Multiple Choice

Choose the correct answer from the alternatives given.
An electromagnetic wave of frequency $\nu= 3\ MHz$ passes from vacuum  into a dielectric medium with permittivity $\varepsilon= 4$. Then

  1. wavelength and frequency both become half.
  2. wavelength is doubled and frequency remains unchanged.
  3. wavelength and frequency both remain unchanged.
  4. wavelength is halved and frequency remains unchanged.
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