A) Assuming a silicon junction breaks down when its maximum internal electric field Em reaches 300 kV/cm, estimate the breakdown voltage BV of the pn junction with the following characteristics: ND = 1016 cm-3

Emo = 5.03E4 V/cm cross-sectional area: A= (100 micrometers)(100 micrometers)= 10-4 cm2

Xd0 = 3.26E-5 cm = 0.326 micrometers Qj0 = 5.23 pC

xpo = .003 micrometers xn0 = .323 micrometers

b) Repeat if ND is doubled to 2E16 cm-3

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

Assuming compressible flow of air and that the measurements are done at flagstaff a pitot static tube that gives the difference of total and static pressure measures 0.35 m of mercury. what is the velocity of air? assume the temperature to be 300k. (submit your excel or matlab calculation sheet)