A rectangular waveguide has dimensions 1 cm × 0.5 cm its

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A rectangular waveguide has dimensions 1 cm × 0.5 cm its cut-off frequency is—

1. 5 GHz
2. 10 GHz
3. 15 GHz
4. 20 GHz

Correct Option: C

From the synopsis provided we get relation of cutoff frequency

f_c =	V_cm	=	3 × 10⁸
	2a		2 × (0.1)

= 1.5 × 10¹⁰
= 15 GHz