Tuesday, February 21, 2017

Make some noise!

Changing Sounds

Introduction



Sounds are vibrations that can travel through different materials. The pitch of a sound is how high or low the sound is. The loudness of a sound is how loud or soft it is.

Sounds are vibrations

Sounds are made when objects vibrate. The vibration makes the air around vibrate, and the air vibrations enter your ear. You hear them as sounds.
You cannot always see the vibrations, but if something is making a sound, some part of it is always vibrating.
Guitar sound


Sound vibrations can travel through different materials

Sounds as vibrations can travel through many different materials.

  • Sound can travel through solids, like metal, stone and wood.
  • Sound can travel through liquids, like water.
  • Sound can travel through gases, like air.
Sound vibrations travel better through some materials than others. For example, sound vibrations travel very well along metal pipes.
Sound cannot travel through a completely empty space (a vacuum), which has nothing, not even air, in it. If there is a vacuum between a sound-making object and our ears, we won't be able to hear the sound.

Thursday, February 2, 2017