At room temperature, an intrinsic alas has 4x minima along < 100> directions, and the following data are available: electronics mass for î valley and x valley are 0.15 m0 and 0.76 m0. the hole mass is 0.76 m0. at what temperature the number of electrons in the î minima and x minima will be equal if the energy separation between them is 0.40 ev? the band gap for alas is 2.23 ev.

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise