A) briefly explain why cv rises with increasing temperature at temperatures near 0 k. (b) briefly explain why cv becomes virtually independent of temperature at temperatures far removed from 0 k. (a) the reason that cv rises with increasing temperature at temperatures near 0 k is because, in this temperature range, the allowed energy levels of the lattice waves are far apart relative to the available thermal energy, and only a portion of the lattice waves may be excited. as temperature increases, more of the lattice waves may be excited by the available thermal energy, and, hence, the ability of the solid to absorb energy (i. e., the magnitude of the heat capacity) increases. (b) at temperatures far removed from 0 k, cv becomes independent of temperature because all of the have been excited and the energy required to produce an incremental temperature change is nearly constant.