If 1.5×1014 boron atoms per cm3 are added to silicon as a substitutional impurity, determine what fraction of the silicon atoms are displaced in the lattice. The lattice constant of Si is 5.43×10−1 m .

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

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)

Atmospheric air has a temperature (dry bulb) of 80° f and a wet bulb temperature of 60° f when the barometric pressure is 14.696 psia. determine the specific humidity, grains/lb dry air. a. 11.4 c. 55.8 d. 22.5 b. 44.1