Question

An air-filled rectangular waveguide has dimensions, a = 215 cm and b = 1.2 cm. The
decreasing order of the cut-off frequencies for different modes is
(a) TEO KUTENTE TE
(b) TEQ TE TE20 TERO
(c) TEO2 <TE = TE20 <<TE
(d) TEOL <TE, KTE, KTE​

Answer 1

Explanation:

so sorry I can't gave you answer