Practice Question

1. Explain how a transmission aerial is used to broadcast radio waves

A high freqency, alternating potential difference is applied across the transmitting aerial, this causes an alternating current to flow in the transmitting aerial. 

This current will cause oscillations in charge which flow up and down the transmitting aerial, causing radio waves of the same frequency to be emitted. 

2. Suggest why the  sound heard from a radio would be similar to the sound being produced in the studio from where it is broadcast.

The sound wave produced from the radio will be of the same frequency as the sound that is being produced in the studio.

3. What is meant by the term oscillations?

Oscillations means changing