Question

Briefly explain the principle underlying tje tuning of radio reciever

Answer 1

Your radio receiver needs a tuner. The antenna will receive thousands of sine waves. The job of a tuner is to separate one sine wave from the thousands of radio signals that the antenna receives. Tuners work using a principle called resonance. That is, tuners resonate at, and amplify, one particular frequency and ignore all the other frequencies in the air. It is easy to create a with a  and an (check out  to see how inductors and capacitors work together to create a tuner). The tuner causes the radio to receive just one sine wave frequency. Then the radio has to extract the voice out of that sine wave. This is done with a part of the radio called a detector or demodulator.