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GATE ECE 2004 | Question: 29

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The phase velocity of an electromagnetic wave propagating in a hollow metallic rectangular waveguide in the $\mathrm{TE}_{10}$ mode is

  1. equal to its group velocity
  2. less than the velocity of light in free space
  3. equal to the velocity of light in free space
  4. greater than the velocity of light in free space
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