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**1. Homework Statement**

How to solve this problem?

An air-filled waveguide of rectangular cross-section (1 cm x 2 cm) is used to

carry EM waves at a frequency of 10 GHz.

Show that only the TE01 mode can be used?

I tried to find the cut-off frequency ( 7.5GHZ) and is that enough to prove that only TE01 can be used?