Calculating the wavelength
Calculate the wavelength, in nanometers, of the light emitted by a hydrogen atom when its electron falls from the n=7 to the n=4 principal energy leve.
a. 4.45 * 10^-20nm
b. 2.17 * 10^-6nm
c. 9.17 * 10^-20 nm
d. 1.38 * 10^14 nm
e. 2.17 * 10^3 nm
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On a cool, rainy day, the barometric pressure is 730mmHg. Calculate the barometric pressure in centimeters of water (cmH2O). Density of Hg = 13.5g/ml; density of water = 1.00g/ml.
Calculate the energy of a photon of blue light that has a wavelength of 432 nm.
A block of dry ice whose mass is 24.4 g sublimes in a room whose temperature is 26.5 oC. What is the entropy change (ΔS) of the CO2?
In an electron microscope, electrons are accelerated to great velocities. Calculate the wavelength, in m, of an electron traveling with a velocity of 7.0 megameters per second. The mass of an electron is 9.1 * 10^-28 g?
Compute the break-even point in dollars for 2012. <-- I got this $2,800,000 2.Compute the break-even point in dollars under each of the alternative courses of action.
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Liquid nitrogen has a density of 0.808 g/mL at -196 C. If 440.0 mL of LN2 is injected into a weather balloon to inflate it, what is the final volume of the balloon at 0.96 bar and 20 C?
A 0.035 M solution of a monoprotic acid is 13 percent ionized. Calculate the ionization constant of the acid.
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