Constructive Interference:

IMG_1036-smfl5w

Constructive Interference is when a crest from one source meets a crest from another source

Deconstructive Inference:

deconstructive wave-1brs9k9

Deconstructive Interference is when a crest and a trough meet

Standing Wave:

standing wave-2est52l

When interfering waves have the same amplitude and wavelength the resultant interference pattern remains nearly stationary

Sound is a pressure wave, which consists of a compression phase and a rarefaction phase. A noise-cancellation speaker emits a sound wave with the same amplitude but with inverted phase

pulse IMG_1017 2-1g8ni4d

single wave sideways

periodic IMG_1018 2-1v5unow

continuous wave

transverse IMG_1019 2-12z3hzk

a wave vibrating at right angles to the direction of its propagation.

longitudinal IMG_1021 2-1s4c3tg

a wave vibrating in the direction of propagation.