Which ones are correct??

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.

What is a costume plot? why is it important to a film or theater production?