sound
produced by vibrating objects needs 3 things to work
sound
arrangement of atoms or molecules solid liquid or gas
States of matter
a sound that is reflected back from a surface
echo
vibrating matter that push against one another to carry energy
sound waves
matter with atoms that are far apart
gas
a wave produced by vibrations or a disturbance on the surface
Water wave
energy from vibrations of objects
sound energy
matter with atoms that are close together
liquids
these are produced by earthquakes which travel though the surface of the earth
seismic waves
how dose sound travel
in all directions
matter with atoms that are vary close together and vibrate in place
Solids
doppler Effects