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1. Zinc selenide has a band gap of 2.58 eV. Over what range of wavelengths of visible light is it transparent?
2. Briefly explain why the magnitude of the ab- sorption coefficient (b in Equation 21.18) depends on the radiation wavelength.
3. The fraction of nonreflected radiation that is transmitted through a 5-mm thickness of a transparent material is 0.95. If the thickness is increased to 12 mm, what fraction of light will be transmitted?
Transmission
4. Derive Equation 21.19, starting from other expressions given in the chapter.
5. The transmissivity T of a transparent mate- rial 15 mm thick to normally incident light is 0.80. If the index of refraction of this mate- rial is 1.5, compute the thickness of material that will yield a transmissivity of 0.70. All reflection losses should be considered.
a hot-water stream at 80 degrees c enters a mixing chamber with a mass flow rate of 0.5 kgs where it is mixed with 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.
the closed tank is pressurized at 15 psig by air as shown. the liquid is water. determine the velocity of the water
Fluid is moving between two plates the top plate is moving with a velocity V, the distance between the plates is h, and the flow is completely horizontal; select the appropriate boundary condition of the viscous flow.
Calculate the service factor for a simple lawn mower driven by a two stroke engine. The lawn mower is used by a service for 8 hours per day. If the lawnmower normally operates at 1200 rpm and 2 hp what is the starting torque?
a 1 meter section of 1040 steel square tubing is loaded in tesnion. the tubing has an outer edge length of 10mm and a
during some actual expansion and compression processes in piston-cylinder devices the gases have been observed to
A parcel is lowered onto a conveyor belt that is moving at 4 m/s. If the coefficient of kinetic friction between the parcel and the belt is 0.25, calculate the time that it takes for the parcel to reach the speed of the belt.
the 20-lb car is released from rest at time t0 on the inclined surface. the force p 8t lb acts on the cart where t is
an ideal diesel cycle with air as the working fluid has a compression ratio of 20 and a cutoff ratio 2.1. at the
H2O at 350oF, 60 psi enters an insulated nozzle at 10 ft/s. It leaves at 1440 ft/s and 35 psi. What is the isentropic efficiency?
a particle moves along the curve yx2 - 4m with a constant speed of 5 ms. determine the point on the curve where the
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