Explain the working of a Poincare Sphere.

A cell phone sends and receives electromagnetic waves in the microwave frequency range.

a) Explain the physics of how an oscillator creates these waves.

b) Research the possible side effects of using cell phones. Citing at least three websites

that you consider reliable, write a short 100- to 150-word paragraph summarizing

three main conclusions based on your research and your opinion; in other words, will

your cell phone usage change, based on what you have learned?

#5b. Suppose that the two masses in the previous problem remains separated by a distance d meters, but the second mass is replaced by a mass that is 8.0 times smaller than the one it replaces. In terms of F, the original force on each of the masses, what is the magnitude of the force on the first mass now?   Give your answer in the form "(a.bcd)F" N.

#5a. The magnitude of the gravitational force that a point mass exerts on another point mass when they are separated by a distance of d meters if F Newton. Now suppose that the second mass is moved so that the distance between them is now 0.68d meters. What is the magnitude of the new force that this second mass will experience at this new location? Give your answer in terms of F. For example, if the force is 7.85 times F then your answer would be (7.85)F. If the force is 0.55 times F then your answer would be (0.55)F. Give your answer rounded to 2 decimal places.

Explain why the classical theory of light as an electromagnetic wave (or of electrons as particles) is unable to explain the following phenomena whereas quantum mechanics is successful.

1. (1) The turn-on voltage of differently colored LEDs

2. (2) The existence of transparent conductors

3. (3) The decrease in frequency of photons scattered off of atoms

4. (4) The spectrum of blackbody emission

Derive/explain how thermal conductivity can be explained in terms of the kinetic theory of gases.

An 11.0-W energy-efficient fluorescent lightbulb is designed to produce the same illumination as a conventional 40.0-W incandescent lightbulb. Assuming a cost of $0.116/kWh for energy from the electric company, how much money does the user of the energy-efficient bulb save during 140 h of use? (Give your answer to the nearest cent.)
$

1: Under high resolution, the spectral line of Sodium (Z = 11) around 589 nm resolves into two lines at 589.5 nm and 588.9 nm due to spin-orbital coupling splitting the 1p shell into 2P_3/2 and 2P_1/2.

Part A: Calculate the difference in energy between the 2P_3/2 and 2P_1/2 states.

Part B: From this energy difference, estimate the magnitude of the internal magnetic field.

Part C: If a magnetic field of 1 Tesla is applied to the Sodium atoms, the lines split further. Please construct an energy level diagram to show the split lines. How many distinct lines would you expect?

An electric current passes through a metal strip 0.60 cm by 6.0 cm by 0.18 mm , heating it at the rate of 52 W . The strip has emissivity e=1.0and its surroundings are at 250 K . What will be the temperature of the strip if it's enclosed in (a) a vacuum bottle transparent to all radiation and (b) an insulating box with thermal resistance R = 9.0 K/W that blocks all radiation?

(A and B answers should be in K)

Diamagnetic susceptibility of atoms:

(a) Estimate the upper limit for thediamagnetic moment of an atom.Use an atom with many electrons such as Bi. From the magnetic moment, calculate the diamagnetic susceptibilityand compare it to the experimental value, which is Xm=−1.7×10−4.

A horizontal incident beam consisting of white light passes through an equilateral prism, like the one shown in the figure

What is the dispersion (θv−θr) of the outgoing beam if the prism's index of refraction is nv = 1.509 for violet light and nr = 1.431 for red light?

A hollow ball has mass M=2.0kg, radius R=0.35m, and moment of inertia about the center of mass I=(2/3)MR². The ball is thrown without bouncing, to the right with an initial speed 2.0m/s and backspin. The hoop moves across the rough floor (coefficient of sliding friction = 0.25) and returns to its original position with a speed of 0.5 m/s. All surfaces and the hoop may be treated as ideally rigid. Develop an expression for angular velocity of the hoop as a function of time while it is rolling with slipping. Determine the backspin with which the hoop must be released as well as the furthest distance travelled to the right.

A charge Q is distributed in the volume of a sphere of radius R with a density non-uniform load cubic p = B (R - r) , where b is a constant and r is the distance to the center of the sphere determine: The values ​​of the potential in the center and on the surface of the sphere.

A conventional activated-sludge plant treats 10.0 MGD of municipal wastewater with a BOD concentration of 240 mg/l and suspended solids of 200 mg/l. The sludge flow pattern is shown in Figure 11-1 of the textbook with a gravity belt thickener to concentrate the excess activated sludge. Primary and thickened activated sludge are pumped separately to the anaerobic digester. The primary clarifier removes 50% of the suspended solids and 35% of the BOD. The primary sludge solids content is 4.0%. The operating F/M ratio for the activated-sludge process is 0.3 lb BOD per day per pound of MLSS. The solids content of the waste sludge removed from the secondary clarifier is 16,000 mg/l; the gravity belt thickening captures 95% of the solids in the sludge and increases the solids content of the thickened sludge to 7%. Calculate: a) Flow rate of primary sludge, in gals/day b) Flow rate of thickened secondary sludge, gals/day. c) Flow rate and solids concentration of the blended sludge

A Si npn transistor at T = 300K has an area of 10^-3 cm² , neutral base width of 1µm, and doping concentrations of N_E= 10¹⁸ cm^-3, N_B = 10¹⁷ cm^-3, N_C = 10¹⁶ cm^-3. Other semiconductor parameters are D_B= D_E =20 cm²/s, τ_E0= τ_B0= =10^-7s, and τ_C0=10^-6 s. Assuming the transistor is biased in the active region and the recombination factor is unity, calculate current for (a) V_BE = 0.5V; (b)I_E =1.5 mA, (c) I_B = 2µA

Starting from rest, two skaters "push off" against each other on smooth level ice, where friction is negligible. One is a woman and one is a man. The woman moves away with a velocity of +2.4 m/s relative to the ice. The mass of the woman is 51 kg, and the mass of the man is 75 kg. Assuming that the speed of light is 4.6 m/s, so that the relativistic momentum must be used, find the recoil velocity of the man relative to the ice.