This week in expedition, Class 13 have been learning that sound is made by vibrations and travels in sound waves. They used guitars to investigate volume and discovered that the harder they strummed/plucked the strings, the louder the volume. The softer they strummed the strings, the quieter the volume.
They confirmed their findings by clapping their hands together, first hard and then soft. The harder they clapped, the louder the volume.
Ruby drew sound waves to represent the volume of different sounds.
Later in the week they carried out an experiment to identify pitch.
First, they began to write out their experiment…
and then they filled each bottle carefully with the same amount of water.
They carefully blew across the top of the bottles to listen to the pitch of the sounds. They discovered they all sounded the same!
The children then poured different amounts of water into the bottles until each bottle had a different level of water.
Now when they blew across the bottles, each one sounded different, with a higher or lower pitch.
The conclusion of their experiment was the bottles with the most amount of water had a higher pitch and the bottles with less water, a lower pitch.
Well done my little scientists!!