In our Science topic - Sound, we have been learning about pitch.
Higher pitch is caused when sound waves move through the air causing FAST vibrations.
Low pitch is caused when sound waves create SLOWER vibrations.
We experimented creating different pitch - using various objects. eg; we filled jars of water and hit them with a spoon to create lower, higher and highest pitch.
We used cardboard boxes and rubber bands at different tensions to create different pitch. And we hung up tins and filled them with water. Did you know ... the more water you put in a tin - the LOWER the pitch! Most of us predicted it would make a higher pitch!
We even created the song 'Mary Had A Little Lamb" - this was very challenging, but some of us did it!