Sound is the movement of energy through substances in
longitudinal(compression / rarefaction)waves.
In our atmosphere there are lots of air molecules while we make
a noise or while we play a song the air molecule vibrates and
releases a energy called sound.
Sound is considered as a form of energy because:
- It obeys the first law of thermodynamics which states that
energy can neither be created nor be destroyed but it changes from
one form to another.
- It is considered as a mechanical energy which has both
potential as well as kinetic energy.
- Sound is produced when a force causes an object or substance to
vibrate- the energy is transferred through the substance in a
wave.
- Example:A vibrating drum in a disco transfers the sound energy
to the room as sound. Kinetic energy from the moving air molecule
transfers the sound energy to the dancers eardrums. Notice that
kinetic energy(movement)energy in the sticks is being transferred
into sound energy
Sound vibrations create sound waves which move through mediums
such as air and water before reaching our ears.