The disturbance that occurs as longitudional waves travel through a medium can be described as a series of   oscillations and refractions.   destructions and constructions.   propagations and compressions.  rarefactions and compressions.

What are the applications of electromagnetic waves

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.