A medium and a pressure differential
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For refraction to occur in a wave, the wave must enter a new medium at an angle.
A standing wave can occur only at specific frequencies that are called natural frequencies.
Transverse waves occur when the motion of medium is at right angels (perpendicular) to the direction of the wave
When the wave hits an object it reflects (bounces) off the object
Interference does not occur when one wave is brighter than another, and the fainter wave cannot be observed. It occurs when two or more waves overlap.
amplitude Longitudinal waves occurs when the motion of the medium. This is parallel to the direction of the wave.
A node is a point along a standing wave where the wave has minimal amplitude. The opposite of a node is an antinode, a point where the amplitude of the standing wave is a maximum. These occur midway between the nodes.
A tsunami is an ocean wave that is caused by an earthquake. It would occur after an earthquake.
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The amplitude of a wave is the height of a wave crest or the depth of a wave trough from the rest position.
Brain wave