Wave properties

H.Pulse wave

Non-repeating wave, single disturbance.

I. Periodic wave

Regularly repeating disturbances.

J. Transverse wave

Spring is pulled sideways, and the wave across the spring to the direction that the wave will travel.

K. Longitudinal wave

Spring are compressed and let go, Disturbance is in the same direction as the direction of travel.

L. Destructive interference

The energies combine to work against each other as the periodic wave, the crest and trough tend to cancel out when two waves meet.

The video is the same as periodic wave.

M. Constructive interference

When two same size crest or trough meet from different direction, the energy of two wave combine to form a bigger wave when they meet.

N.Standing wave 

have the same amplitude and wavelength, the resultant interference pattern remains nearly stationary. A node/nodal point remains at rest throughout the interference of the pulses.