The half-life of1 is 8.04 days. (a) calculate the decay constant for this isotope. (b) find the number of 1311 nuclei necessary to of 0.5 uci produce a sample with an activity

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.