In a microwave test bench, why is the microwave signal amplitude modulated at 1 kHz?
(a) To increase the sensitivity of measurement
(b) To transmit the signal to a far off place
(c) To study amplitude modulation
(d) Because crystal detector fails at microwave frequencies
I had been asked this question in an internship interview.
The doubt is from Advanced and Tricky Questions in chapter Advanced and Tricky Questions of Electromagnetic Theory