(a) A cubic crystal contains two atoms per unit cell and a unit cell size of 0.7 x 0.7 x 0.7 nm3. The speed of sound in this material is 3000 ms-1. What is the Debye temperature in kelvin of this material? Write your answer correct to three significant figures. Debye temperature = K (b) The same material is a typical divalent metal (each atom provides two conduction electrons). Calculate the Fermi temperature of the electrons in this material. Write your answer correct to three significant figures. Fermi temperature = K

(a) A cubic crystal contains two atoms per unit cell and a unit cell size of 0.7 x 0.7 x 0.7 nm3. The speed of sound in this material is 3000 ms-1. What is the Debye temperature in kelvin of this material? Write your answer correct to three significant figures. Debye temperature = K (b) The same material is a typical divalent metal (each atom provides two conduction electrons). Calculate the Fermi temperature of the electrons in this material. Write your answer correct to three significant figures. Fermi temperature = K