The semiconductor materials have the same properties except that material A has a bandgap of 1.0eV and material B has 1.2eV. Determine the ratio of intrinsic carrier density ni of material A and B at 300K.

Two slings are used to lift a girder of length l and uniform weight per unit length. what is the best position for the slings if the bending moment due to the weight of the girder is to be kept to a minimum?

Asharp-edged orifice is placed in a 10-in-diameter pipe carrying ammonia. if the volume flow rate is 25 gal/min, calculate the deflection of a water manometer (a) if the orifice diameter is 1.0 in and (b) if the orifice diameter is 7.0 in. the ammonia has a specific gravity of 0.83 and a dynamic viscosity of 2.5 x 10-6 lb s/t2

Asteam engine isentropically expands 5 kg/sec of steam from 0.7 mpa, 220°c, the exhaust is dry and saturated. determine (the work of nonflow process (b) the final temperature, and (c) the work of a steady flow process