D Question 6 1.5 pts An iron block has a uniform temperature difference 27.7 K in one direction (i.e. adiabatic walls are parallel to the heat flux and isothermal walls are perpendicular to the heat flux passed by the block). If the heat flux is 224.9 W m2 K1, the length of the block in the direction passing heat is 7.9 m, and the phonon-supported thermal conductivity is 0.90 W m2 kthen what is the free electron thermal conductivity (W mk) contribution? D Question 7 1.5 pts A metal cube with 6.9 m sides, has one surface at 18,4 K and the opposite surface at 1.7 K. The thermal conductivity is 7.2 Wm+k1. Just consider one-dimensional heat flow between the two sides. Calculate the total amount of heat ()) conducted in 1 minute