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Particles and Waves
The diffraction of radiation can be used to determine the spacing between atoms. In practice, the wavelength of the radiation used should be restricted to a value which is of the same order of magnitude as the interatomic distances to be determined. Such experiments are commonly performed using X-rays (electromagnetic radiation), however a beam of subatomic particles, such as of neutrons or electrons, may also be used if their corresponding de Broglie wavelength is of the appropriate magnitude.
Calculate the de Broglie wavelength of a neutron (mn = 1.67493×10-27 kg) moving at one eight thousandth of the speed of light (c/8000).
(Enter at least 4 significant figures.)
Calculate the velocity of an electron (me = 9.10939×10-31 kg) having a de Broglie wavelength of 180.1 pm.
Can anyone please explain me in detail what the solution is and what is one eight thousand of speed of light? is it (2.9927x10^8/8000)?
Thyroxine, an important hormone that controls the rate of metabolism in the body, can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0g of benzene, the freezing point of the solution is 5.144 degrees celcius.
suppose 12.0g of carbon (c) react with 70.0g of sulfur (s) to give 76.0g of the compound carbon disulfide (CS2).In the process all the carbon used up, but some elemental sulfur is left over.
an unknown solid salt is dissolved in water to form a solution. describe one chemical and one physical way that the
63.0 mL of a 1.20 M solution is diluted to a volume of 208 mL. A 104-mL portion of that solution is diluted using 157 mL of water. What is the final concentration.
The head of a strike anywhere match contains tetraphosphorous trisulfide, P4 S3. In an expriment, a student burned this compound in an excess of oxygen and found that it evolved 3677 KJ of hea per mole of P4S3 at a constant pressure of 1 atm.
Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]2 By what factor does the rate change if the concentration of BrO3- is doubled and that of Br- is doubled? Just put in the number as a whole number or fraction.
What mass of heptane, C7H16, is required to produce 90.2 kJ of heat at constant pressure from its combustion in excess oxygen?C7H16(l) + 11O2(g) → 7CO2(g) + 8H2O(l)
The compounds listed above were heated in ethanol and sodium hydroxide for approximately 60 minutes. Then extracted with dichloromethane to get the final product.
A sample of N2O3 (g) has a pressure of 0.017 atm. The temperature of (in K) is then doubled and the N2O3 undergoes complete
Because electron transport is coupled to ADP phosphorylation, it is theoretically possible to drive electrons backwards up the chain, against the potential gradient, at the expense of ATP.
A radiometric dating technique uses the decay of U-238 to Pb-206 (the half-life for this process is 4.5 billion years) to determine the age of the oldest rocks on Earth and by implication the age of Earth itself.
Asparagine - while it helps the nervous system maintain its equilibrium, Asparagine it also acts as a detoxifier, and it regulates metabolism. How does its shortage affect our body functions?
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