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A slab of intrinsic GaAs, 3cm long, 2cm wide, and 0.3cm thick, is exposed to light. The light is absorbed with an absorption coefficient a=500cm-1 (this means that the light intensity decreases in the material exponentially with distance t, and is proportional to exp(-at)). The light is monochromatic with a wavelength of 750nm and an intensity of 5×10-4W/cm2. (Photon energy (eV) is given by 1.24/wavelength (µm).)
What photon flux is incident on the slab?
A work platform is elevated on the end of a boom that has the ability to extend its length and vary its angle with respect to the ground. The platform width is large compared to the boom diameter so that it is possible to load the boom eccentrically ..
A thin film of constant thickness, h, flows down an angled plate due to the influence of gravity. Using mue? for the viscosity and reo? for the density of the fluid, find the velocity profile u(y) following the coordinates below. Clearly state all as..
a flat steel plate is 1 m long and 1 m wide. air flows over the plate at 10 ms. the plates leave a heat treatment oven
consider a simple brayton cycle using air as the working fluid has a pressure ratio of 12 has a maximum cycle
Azeotrope of chloroform–methanol. Vapor–liquid equilibrium data at 101.3 kPa are given for the chloroform–methanol system on p. 13-11 of Perry’s Chemical Engineers’ Handbook, 6th ed. From these data, prepare plots like Figures 4.6b and 4.6c. From the..
compressed air is stored in a pressure bottle with a volume of 10 ft3 at 3000 psia and 140 f. at a certain instant a
If the speed of the man at A (XA = 5m and YA = 1m) is VA = 9 m/s and the increase of his speed is dVA/dt = 13 m/s2, calculate the magnitude of his acceleration and the slop angle at this point.
A periodic function f(t)is of period 10 defined by f(t)=N+t2, 0
a thin-walled pipe of d 20 mm internal diameter is subjected to a constant heat flow on the surface of strength q400 w
the velocity in a two-dimensional flow field is given by the equation v i2xt - j2yt where the velocity is in ms when x
Air at 22 kPa, 220K and 250 m/s enters a turbojet engine in flight at an altitude of 10,000m. The diffusor slows the air down to a very low speed relative to its inlet. The pressure ratio across the compressor is 12. The turbine inlet temperature is ..
Single degree of freedom vibration problems with forcing functions, Need help with this Undergraduate problem where two dampers are in series.
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