sound- elements - notation - form - pentatonic

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In space there is a vacuum and this is about the only thing sound does not travel through. You can scream your head off and no-one will hear you!
Instruments like woodblocks and cymbals make sounds like noises.
This is because they make waves that do not make a pattern.

The note middle A is made when something vibrates at 440 times per second.
The next A (8 steps or an octave higher) is made by a vibration that is twice as fast (880Hz).

Double the speed of vibration and you get the next note higher with the same name.
This is called an octave.

There is a huge amount of energy in thunder. Have you ever felt the vibrations from a big lorry passing by. The sound is strong enough to shake the ground.
Sound (or sonic) vibrations are used to clean complicated mechanical objects in a tub of liquid.
You can now even use sound to clean your teeth (in a sonic toothbrush the vibrations kill the bacteria on your teeth and gums).

Two different people playing the same instrument make different sounds.
Plucking a string has a different timbre to bowing it.

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