Which are the four major components of the compression refrigeration cycle in order

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

=force × distance a. work b. velocity c. pressure d. momentum

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.