9. A circuilar air filled waveguide of radius 5 cm is operated in the THoi

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9. A circuilar air filled waveguide of radius 5 cm is operated in the THoi mode. The waveguide is then completely filled with a dielectric of relative permittivity 2.25 and relative permeability 1.0. The cut-off wavelength for the THoi mode is 0.082 m when the waveguide is air-filled.When the waveguide is filled with the dielectric, the cut-off frequency will become nearly

Options:

A . 1.06 GHz

B . 2.44 GHz

C . 3.66 GHz

D . 4.00 GHz

Answer: Option B

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