Sound

ears detect sound

ear drum

vibrations

air

solids

liquids

bouncess

echo

echo location

dolphins

bats

submarines

energy

wave

longitudinal

click to edit

the vibrations from the speaker make the sand that was on the cardboard on the speaker bounce up and down.

and oscilloscope allows you to see sound waves.

the higher the top curve the bigger the amplitude, the greater the amplitude the greater the sound.

the higher pitch the shorter the waves, the lower the pitch longer the waves.