A lossless air-filled waveguide has dimensions 8 cm × 5 cm. For the TM11 mode propagating at an operating frequency that is 1.5 times the cut-off frequency of the mode, calculate (a) critical wave number, (b) cut-off wavelength, (c) operating wavelength, (d) guide wavelength, (e) phase velocity, (f) cut-off frequency (g) Propagation constant