1. A large loudspeaker is called a tweeter.

2. A small loudspeaker is called a tweeter.

3. The world’s biggest radio telescope is made of aluminum.

4. Sound travels faster than light.

5. An antenna can only pick up radio waves.

6. Cellular phones use relayed radio signals.

7. Parabolic antennas are painted white to look nice.

8. Radio astronomy is called that because astronomers listen to the radio for UFOs.