Sound waves are invisible but we can sometimes observe materials vibrating because of these waves
Sound waves can be visually represented on an oscilloscope
EXAMPLE QUESTIONS
Have you even seen objects vibrating because of sound?
How can you feel sound vibrations?
How are high notes different from low notes?
How can you make a quiet sound louder or a loud sound softer?
SOUNDS TRAVEL OUTWARDS
Sound vibrations travel in all direction away from the source of the sound in a manner similar to the ripples of water created when a stone is thrown into a pond.
Sounds however, travel in all direction s, not just outwards, but upwards and downwards as well.
ALTERING THE VIBRATION CAN ALTER THE SOUND
Changing the vibration affects the volume, pitch or tone of the sound produced.
SOUNDS ARE INVISIBLE
Although sound is invisible, we sometimes can see its effects when objects vibrate (in a large window, for example).
An instrument called an oscilloscope can be used to produce patterns that represent sounds.
