physics revison

waves and sound 

• Sound comes from vibrations. These vibrations create sound waves which move through mediums such as air and water before reaching our ears.

• Our ears vibrate in a similar way to the original source of the vibration, allowing us to hear many different sounds.

• Dogs can hear sound at a higher frequency than humans, allowing them to hear noises that we can’t.

• Sound is used by many animals to detect danger, warning them of possible attacks…