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A nucleus in an excited state will return to its ground state, emitting a gamma ray in the process. If its mean lifetime in a particular exited state is about 6.35×10-12 s, what is the uncertainty in the energy of the corresponding gamma ray photon? And, what is the uncertainty in the frequency of the gamma ray? Consider an electron constrained to travel in a '1-dimensional box' of length 4.510×10-9 m. (Click here for more information on a particle in a box.) What is the energy of electron for the n=4 state? What is the wavelength of the photon emitted if the electron drops from the third excited state (n=4) to the ground state (n=1)?
What mass of gold is produced when 7.00 A of current are passed through a gold solution for 49.0 min
If a laser operated on the n=5 to n=2 transition of a H atom, what wavelength in nm photon would be emitted? (E2= -82 kJ/mol, E1= -328 kJ/mol)
How much heat is required to warm 211 g of ice from -45.9°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C?
The solubility product of PbBr2 is 8.9x10^-6. Determine the molar solubility in the following. (a) pure water (b) 0.20 M KBr solution (c) 0.15 M Pb(NO3)2 solution
Calculate the pH of the solution after the addition of 100mL of 1.00 M HCL. the Ka for Hf is 3.5*10-4
A solution of hexane and heptane at 30 degrees C with hexane mole fraction 0.305 has a vapor pressure of 95.0 torr and a vapor-phase hexane mole fraction of 0.55. Find the vapor pressures of pure hexane and heptane at 30 degrees C. State any appro..
Explain what is the mole fraction of methane in the mixture. Assume that the water produced by the combustion is in the gaseous state.
A detailed mechanism for the formation of ethyl acetate from ethanol as well as acetic acid with H2SO4 as catalyst
Crystalline solids are well-ordered arrays of atoms or molecules. Crystalline solids may be metallic solids, molecular solids, or ionic solids.
How many moes of diethylamine((C2H5)2NH, Kb-1.3E-3) must be added to 447ml of distilled water to produce a solution with a pH of 12.787? Can someone explain this step by step?
a photon has a wavelength of 741nm calculate the energy of the photon in joules
The dissociation of calcium carbonate has an equlibrium constant of kp=1.16 at 800 degrees c. CaCO3(s) CaO9s)+CO2(g). what is the kc
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