To nullify means to render ineffective. If you nullify a contract. a warranty, or even a marriage, the effect is as if the thing had never happened. In law ( which is sometimes redundant ) things are sometimes said to be null and void - that is, nothing and nothing. Another example of legal redundancy is the term cease and desist which literally means: stop and stop.
Although they are not true examples of this type of wave, the waves on the surface of water approximate _ transverse _ waves. 7. The distance between two successive wave crests (or troughs) is called the. _ wavelength _ of the wave. 8. The height of a wave crest (or depth of trough) above the original undisturbed surface is called the _ amplitude _ of the wave. 9.
The crest is the highest part of a of the wave and the trough is the lower part of the wave. The longitudinal waves move the medium parallel to the direction the wave is moving. Longitudinal waves have compressions and rare fractions.