nasa launched a spacecraft that it hopes to crash into an asteroid next year. what’s the purpose of the mission?

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.

It is really hard for me right know

To a of 4 x hz is 1. 0. mm nm nm