Question

If the reflection co-efficient is ½ then emissivity is ___

(a) 3/4

(b) 1/4

(c) 1/2

(d) 3/2

This question was posed to me by my school principal while I was bunking the class.

I want to ask this question from Antenna Noise Temperature in division Antenna Parameters – II of Antennas

Answer 1

The correct option is (a) 3/4

Explanation: Emissivity in terms of reflection coefficient is given by \(\epsilon=1-\mid\Gamma_s\mid^2=1-\frac{1}{4}=\frac{3}{4}.\)