Answer :
1. A radio wave is not a sound wave, it is an electromagnetic wave.
2. A radio receives radio waves and converts them to an electrical signal. The radio circuit then converts the electrical signal to sound waves. Radios have an amplifier to boost the power of the sound waves.
3. NASA, the National Science Foundation (U.S.) and other astronomers, use radio telescope to study space.
2. A radio receives radio waves and converts them to an electrical signal. The radio circuit then converts the electrical signal to sound waves. Radios have an amplifier to boost the power of the sound waves.
3. NASA, the National Science Foundation (U.S.) and other astronomers, use radio telescope to study space.
