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The rays of the Sun that cause tanning and burning are in the ultraviolet portion of the electromagnetic spectrum. These rays are categorized by wavelength. So-called UV-A radiation has wavelengths in the range of 320-380 nm, whereas UV-B radiation has wavelengths in the range of 290-320 nm.
(a) Calculate the frequency of light that has a wavelength of 320 nm.
(b) Calculate the energy of a mole of 320-nm photons.
(c) Which are more energetic, photons of UV-A radiation or photons of UV-B radiation?
(d) The UV-B radiation from the Sun is considered a greater cause of sunburn in humans than is UV-A radiation. Is this observation consistent with your answer to part (c)?
One tablespoon of peanut butter has a mass of 15g. It is combusted in a calorimeter whose heat capacity is 130 kJ/degree centigrade. The temperature of the calorimeter rises from 22.3 to 25.3 degree centigrade. Find the food caloric content of pea..
Problem- 1) The boiling point of water at 754 mm hg is 99.78 C. What mass percent of sucrose (c12h22o11 a nonelectrolyte) should be present in order to raise the boiling point to 100.00 C at this pressure. (Kb = .52 C/m)
A titanium rod of length 10 cm and circular diameter of 2 cm is pulled in tension with a load of 100000 N. The rod elongates by 0.01 cm under the load but recovers to its original length when the load is released.
What is the freezing point (°C) of a solution prepared by dissolving 11.3 g ofCa(NO3)2 (formula weight= 164 g/mol) in 115 g of water? Assume that i=3.00 for Ca(NO3)2 and the molal freezing point depression constant for water is1.86°C/m.
Dinitrogen pentoxide, (N2O5), decomposes by first order kinetics with a rate constant of (3.7E-5)s-1 at 298k how long will it take the concentration to decrease from 0.0233mol/L to 0.0176mol/L ?
the secondary bonding of gas molecules to a solid surface is a common mechanism for measuring the surface area of
What are the major differences between "theories", "hypotheses" and "laws". What is an example that would explain them.
Explain how many moles of KMnO4 are present in 280mL of a 4.80×10-2 M solution. Explain how many milliliters of 11.1M HCl solution are needed to obtain 0.260 mol of HCl
How do you go from a cyclohexanone to a 1-cyclohexenol?
what is the mass, in kilograms, of Avogadro's number of olympic shot put balls if each one has a mass of 16lb? How does this compare with the mass of Earth, 5.98x10^25 kg.
Which salt would you expect to dissolve readily in acidic solution. calcium phosphate, Ca3(PO4)2 calcium sulfate, CaSO4 Calculate K for the reaction of H3O+ with the PO43- anion. Calculate K for the reaction of H3O+ with the SO42- anion.
the concentration of carbon monoxide in a sample of air is 9.2 ppm. there are how many molecules of CO are in 1 liter of 755 torr and 23 degrees celcius
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