Sound Waves

low pitched

high pitched

low pitched with short wavelengths

high pitched with long wavelengths

cut through the tubes

vibrate through the tubes at different lengths

increase the frequency

decrease the frequency

reflection of sound

rarefaction

refraction of sound

echo

string is pushed

string is pulled

string is banged

string lift up

echo destination

echolocation

echo displacement

echo dictation

soft surfaces

thick surfaces

thin surfaces

hard surfaces

low

high

high pitched

low pitched

there is no pressure in vacuum

there is no air in vacuum

there is no humidity in vacuum

there are no particle in vacuum

low frequency

low pitch

low amplitude

high pitch

80 dB

100 dB

120 dB

140 dB