Germanium to which 5 x 1022 m—3 sb atoms have been added is an extrinsic semiconductor at room temperature, and virtually all the sb atoms may be thought of as being ionized (i. e., one charge carrier exists for each sb atom). (a) is this material n-type or p-type? (b) calculate the electrical conductivity of this material, assuming electron and hole motilities of 0.1 and 0.05 m2/v • s, respectively.

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

With increases in magnification, which of the following occur? a. the field of view decreases. b. the ambient illumination decreases. c. the larger parts can be measured. d. the eyepiece must be raised.

Air at a pressure of 1atm and a temperature of 40 c is in parallel flow over the top surface of a flat plate that is heated to a uniform temperature of 120 c. the plate has a length of 0.40m (in the flow direction) and a width of 0.15m. the reynolds number based on the plate length is 50, 000. what is the rate of heat transfer from the plate to the air? if the free stream velocity of the air is doubled and the pressure is increased to 10 atm what is the rate of heat transfer?