Sound are caused by vibrations (longitudinal

Particles in a longitudinal wave vibrate the same way as the wave

Sound is a way to transfer energy

Sounds are made when things vibrate

Sound needs a medium to pass on the vibrations

Unit is Measured in Hertz (Hz)

Pitch is how high or low a sound is

High Frequency sounds have a high pitch

The amplitude of a wave is how far the particles move as the vibrations pass.

The loudness of a sound is also described as the volume or the intensity of the sound.

Sound waves can be reflected by a material. This usually happens if the material is hard. Soft materials absorb some of the sound that reaches them, and transmit only a little.

When a sound wave moves energy from one place to another, we say that the energy has been transferred. The energy spreads out in all directions because the particles move in all directions unless something stops them. This means that the intensity of a sound gets less as you get further from its source.