If the current mass of the universe consists of 75% protons and 25% 4He, what is the current ratio of protons to neutrons?
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If the current mass of the universe consists of 75% protons and 25% 4He, what is the current ratio of protons to neutrons?
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Universe consists of 75% protons and 25% 4He.
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- A group of geochemists have been analyzing a sample of radioactive material. After plotting ln(a) versus t, they calculate a slope value of -0.78·10−9 s−1. Determine the half-life of this material in years.U-235 sphere the size of a Tootsie Pop Assume that a spherical volume of pure U-235 is the size of a Tootsie Pop. The per capita electrical energy usage (i.e., per person per year) in the U.S. is 11,496 kw-hrs a) How many years would this amount of U-235 power the average person if all the U-235 atoms were fissioned? b) What would be the approximate volume of the waste produced, when the entire sample has fissioned? (Describe this qualitatively.) Assumptions to use: • Pop diameter = 1.25 inch • Density of the U-235 sample = 18.95 g/cc . The atomic mass is 235.044 amu • 180 MeV of heat energy are available from each fission . The efficiency for thermal to electric conversion is 0.32 . Avogadro's number = 6.022e23.The density of aluminum is 2.7 g/cm^3. How much mass is contained in a chunk of aluminum with a volume of 379mL?
- The "classical" radius of a neutron is about 0.79 fm (1 femtometer = 10-15 m). The mass of a neutron is 1.675×10-27 kg. Assuming the neutron is sphereical, calculate its density in kilometer per cubic meterA state-of-the-art proton decay experiment is expected to detect 47% of the proton decays in a body of water. Assuming protons have a lifetime of 1031 years, how many m3 of water would you need in order to see 6 decays per month? (Assume a "month" is one-twelfth of a year.)A spherical ball has a radius of 21.2 cm and weights 88.0 grams. What is it’s density? V=4/3πr3V=4/3?r3