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Light scattering in air. Estimate numerically, using the Lorentz model of the atom, the value of the scattering cross section for molecular nitrogen (N2) for visible light at a wavelength of 500 nm. Use this result to estimate the value of the scattering coefficient R for air at STP. Compare this value with that obtained using Eq. (8.2.22) and the known refractive index of air. (The measured value for 90-degree scattering of unpolarized light, Ru 90, is approximately 2×10-8 cm-1.) Also, estimate numerically the attenuation distance of light in air-that is, the propagation distance through which the intensity falls to 1/e of its initial value due to scattering losses
Water under a gage pressure of 350kPa flows with a velocity of 5 m/s through a right-angled bend that has a uniform diameter of 250 mm
A camera is packed in a box and surrounded by packing material. The box is dropped vertically onto a horizontal surface. The vertical velocity of the box at the time that it hits the surface is v= 5m/s.
Our ESP is collecting 95% of the particles in our exhaust stream. We are under pressure to improve its performance. It has been suggested that if we were to cool the inlet gas from the present 600°F to 250°F, the performance would improve
Determine the chemical oxygen demand (COD) of a mixture of 250 mg/l glutamic acid (C5H10N2O3) and 200 mg/l of glucose(C6H12O6).
The Pomdeterra wastewater treatment plant produces a thick sludge that has a suspended solids concentration of 3.8%. They are investigating a filter press that will yield a solids concentration of 24%.
The 2kg block A and the 5kg block B are initially at rest on the inclined plane at 20 degrees. All surfaces in this system have a coefficient of static friction of 0.6 , and a coefficient of kinetic friction of 0.4.
(a) What are some of the important properties of unalloyed copper that make it an important industrial material (b) How is copper extracted from copper suflide ore concentrates
A 200 3 Computer Problems 250-mm panel of mass 20 kg is supported by hinges along edge AB. Cable CDE is attached to the panel at C, passes over a small pulley at D, and supports a cylinder of mass m.
Four forces act on a small airplane in flight: its weight (26 kN), the thrust provided by the engine (9 kN), the lift provided by the wings (25 kN), and the drag resulting from its motion through the air (3 kN).
If = 300 N , determine the required minimum compression in the spring so that the wedge will not move to the right. Neglect the weight of A and B. The coefficient of static friction for all contacting surfaces is .2 Neglect friction at the rollers.
For the cupboard unit shown in Figure 7(a), determine the largest value of h for which the cupboard will slide before it tips. Let the coefficient of static friction be µs.
Ecocity has two potential sources of water supply: groundwater and a small river fed by a mountain spring. The river supports a lot of fish and other wildlife, so the citizens do not want to use any more of it than necessary. Unfortunately, however, ..
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