The phase velocity for the TE10 mode in an air filled rectangular

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The phase velocity for the TE₁₀ mode in an air filled rectangular waveguide is–

1. Less than C
2. Equal to C
3. Greater than C
4. None of these

Correct Option: C

Always greater than C since the value of sin θ is always less than 1. So 1/sin θ is always greater than 1 that's why V_P > V_C.