Sound

Sound

The sections of the sound waves where the particles are further apart are areas of rarefraction

The sections of the sound waves where the particles are pushed together are areas of compression.

Sonar is used on ships and submarines to detect fish, other vessels or the sea bed.

An oscilloscope is a machine that shows the wave shape of an electrical signal.

All signals become weaker as they travel long distances. This is called noise.

Noise…