Question

The cut off frequency of the dominant mode of a rectangular
waveguide having aspect ratio 2 is 10GHz. The inner broad wll dimension is ____ cm

• A. 2
• B. 1.5
• C. 0.75
• D. 3

Answer 1

The correct option is B 1.5

${f_c|}_{T{E}_{10}}=\frac{c}{2a}$

$10\times {10}^9=\frac{3\times {10}^{10}}{2\times a}$

$a=\frac{3\times {10}^{10}}{2\times {10}^{10}}=1.5cm$