To ensure that only dominant mode TE10 is allowed to propagate in an air filled

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Question
To ensure that only dominant mode TE₁₀ is allowed to propagate in an air filled rectangular waveguide, the lower frequency limit and upper frequency limit are
Options
A. about 25% above f_c for TE₁₀ and 5% below f_c for TE₂₀ mode respectively
B. about 50% above f_c for TE₁₀ and 25% below f_c for TE₂₀ mode respectively
C. about 25% above f_c for TE₁₀ and 25% below f_c for TE₂₀ mode respectively
D. none of the above

Correct Answer

about 25% above f_c for TE₁₀ and 5% below f_c for TE₂₀ mode respectively

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