When the trough of a wave and the crest of a different wave meet, the waves cancel completely. This is called destructive interference.
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The highest points on a standing wave are called antinodes. They represent the points of maximum displacement or amplitude in the wave.
Crests are the top or most compressed part of the transverse or compressional wave. The troughs are the bottom part or the most spread out.
crest
The time it takes a point on a wave to move from its lowest point to its highest point and back to its highest point again is called the period of the wave. It is the time it takes for one complete cycle of the wave to occur. The period is inversely related to the frequency of the wave, which is the number of complete cycles that occur in a unit of time.
The lowest point of a transverse wave is called the trough. It is the point on the wave where the displacement of the medium is at its maximum negative value. The crest is the opposite, being the highest point on the wave where the displacement is at its maximum positive value.
Those are called wavelengths. It is measured from the crest, i.e. the tip or point, of one wave to the one next to it. =============================== Answer #2:There is no spacing between waves. As soon as one wave is finished, the next one begins immediately, without any delay in time or space. But the distance between corresponding points on two consecutive waves is called the "wavelength".
The height of a wave is called its amplitude. Amplitude is the distance from the midpoint of a wave to its crest or trough. It represents the maximum displacement of the wave from its resting position.