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A certain molecule fluoresces at a wavelengh of 400 nm with a half life of 1.0ns. It phosporesces at 500 nm. If the ratio of the transition probabilities for stimulated emission for the S*-->S to
Determine distance traveled by the particle during the time interval t = 0 to t = 4s. (hint: block starts moving from the positive x-axis and then goes back to other way.)
A 5.5 box is on a frictionless 41 slope and is connected via a massless string over a massless, frictionless pulley to a hanging 2.1 weight. What is the tension in the string if the 5.5 box is held
What would be the correlation between the color of your dye solution (crystal violet) and the wavelength of its maximum absorbance in the visible spectrum of the solution? Show your calculations fo
You wish to pass a current through the coil to produce a field that, when combined with the earth's field, creates a net field with the same strength and dip angle (60 below horizontal) as the earth
If this air (the 2500 g) is stored in a cylindrical tank of radius 1.59 what would have to be the length of the tank? (Answer in meters)
What advantages does THF have over using diethyl ether in a grignard synthesis reaction? Why must Grignard reagents be run in an ether solvent?
Assuming that all the energy dissipated by kinetic friction goes into melting a small mass, m, of the ice, and the rest of the ice block remains at -1.5 degrees C, determine the value of m.
What does the term paramagnetism mean? How can one determine experimentally whether a substance is paramagnetic?
A particle moving in a laboratory at 0.8c decays after traveling 3m. How long did it exist as measured by an observer in the laboratory?
A solution of potassium permanganate was standardized by titration with a standard Fe2+ solution at pH 2.0. The iron solution was prepared from 0.7417 g of pure iron wire and required 30.16 mL of th
A solution is prepared by dissolving 10.8 g ammonium sulfate in water to make 100.0 mL of stock solution. A 10.0 mL sample of this stock solution is transferred into a flask and then water was added
If the power output stays constant but the frequency is doubled, what is the amplitude of the wave?
Forgetful Freddy weighed his KHP sample, but forgot to bring his report sheet along, so he recorded the mass KHP on a paper towel. During his titration, which required 18.46 mL of base, he spilled s
Given a fixed area A, what should the rectangle look like if you want the required torque to be as large as possible? What is the upper bound on the torque?
A 3000 kg truck traveling north at 38 km/h turns east and accelerates to 54 km/h. (a) What is the change in the truck's kinetic energy?
A car is driven east for a distance of 41 km, then north for 21 km, and then in a direction 34° east of north for 25 km. Determine (a) the magnitude (in km) of the car's total displacement from
A certain batch of fireflies were observed to "flash" at the rate of 15.4 times per minute at 25°C, and at the lower rate of 5.1 times a minute at a temperature of 15°C.
How far below the release point is the center of mass of the two stones at t = 800 ms? (Neither stone has yet reached the ground.)
What is the equilibrium concentration of fluorine if the initial concentrations of bromine and fluorine were 0.127 moles/liter in a sealed container and no product was present initially?
What angle does the resulting w make with the vertical? (If you want, you can check your answer by showing that the theta that make this angle maximum is sin^-1 (sqrt(7/9) = 61.9 degrees)
A bicycle has wheels with a diameter of 0.590 m. It accelerates uniformly and the rate of rotation of its wheels increases from 189 rpm to 270 rpm in a time of 21.1 s. Find the linear acceleration o
A circular coil of wire 8.20 cm in diameter has 15.0 turns and carries a current of 3.20 A . The coil is in a region where the magnetic field is 0.650 T. a) What orientation of the coil gives the ma
Calcium carbonate combines with HCL to produce calcium chloride, water, and carbon dioxide gas. Write a balance equation for this reaction. How many moles of HCL are required to reat with 2.5 moles