Assume a dampening depth, d, of 30 cm and a period, lambda, of 24 hours (8.64 x 104 sec). Assume a volumetric heat capacity, C, of 0.5 cal/cm °C.
What would the thermal diffusivity, D, need to be to change the temperature at 30 cm?
What would the thermal conductivity, k, need to be to change the temperature at 30 cm?