Question

Which describes a phonograph recording?

The spiral has pieces of code that represent sound.
Flashes of light become pulses of current.
A tiny magnet induces an electric current.
The spiral contains pits and flats.

Answer 1

The option "The spiral contains pits and flats" describes a phonograph recording. A phonograph recording is a method of audio recording on a spinning disc that has a spiral groove containing pits and flats that represent sound waves. As the disc rotates, a needle (stylus) tracks along the groove, detecting the vibrations of the pits and flats, and reproduces the sounds they represent.