A microphone is very much like an ear. Sounds make a surface vibrate, which moves a magnetic coil that produces electrical signals. Those signals are then sent to an amplifier or stereo receiver. Here is a diagram of a microphone.
To receive your award, answer the following by class on Friday:
- The eardrum is also called the _______________ membrane.
- When you play a drum, the resulting sound is because the drum head (the surface of the drum that you strike) is _______________.
- In 1924, two General Electric researchers patented a design for the modern loudspeaker. What were the names of these two scientists?
- It can be difficult to design a single size speaker that can handle a large range of sounds. Many stereo systems use one size speaker to produce low sounds, another size to produce mid-range and still another to produce high sounds. Name one of these special types of speakers.