The common isotope of uranium, 238U, has a half-life of 4.47×109 years, decaying to 234Th by alpha emission.
How many alpha particles are emitted per second by 7.00 g of uranium?
The common isotope of uranium, 238U, has a half-life of 4.47×109 years, decaying to 234Th by...
Using the half-lives for 238U and 235U, the natural abundance of each isotope, and knowing the density of uranium metal is 19.2 g/cm3, calculate the total decay rate (disintegrations per second) of uranium atoms in a solid sphere, 10 cm in diameter. Both 238U and 235U decay by alpha emission. The alpha particle energies are approximately 4.3 MeV and 4.7 MeV, respectfully. There is additional energy released in photons (gammas) and subsequent decay of daughter products. Ignoring all that, using...
A sample of 9.0×109 atoms that decay by alpha emission has a half-life of 90 min. How many alpha particles are emitted between t=50min and t=200min? Express your answer using two significant figures.
7. anium-238 is an alpha-emitter with a half-life of 4.522 x 10 years and an isotope mass of 238.0508 g/mol. This isotope is useful for dating geological samples. A rock from the ocean floor contains 0.4203 g Uranium-238. What is the activity of this rock (from 238U) in counts per minute? Show all of your work. 8. Scientists exploring the new element Covidium (Cv) discover it has various isotopes. Calculate the binding energy per nucleon in units of kJ for...
The half-life of 238U is 4.5×109 yr. Find the number of disintegrations per hour emitted by 1.0 mol of 238U. (Note: 1 year = 365.24 days).
Uranium-235 has a half-life of 7.04 x 108 years. How many years will it take for 99.9% of a U.235 sample decay A. 7.08 105 yr B. 1.0 x 106 yr C. 4.7 x 10º yr D.4.9 x 109 yr * E. 7.08 109 yr
A sample of 7.0×10^9 atoms that decay by alpha emission has a half-life of 70 min. How many alpha particles are emitted between t=50min and t=200min? Express your answer using two significant figures.
The natural radioactive decay of 235U is by Alpha emission with a half-life of 704 Million years. Remember that an Alpha particle consists of two protons and two neutrons. What is the radiogenic daughter isotope produced by this decay? 231U 231Th 235Th 238U 206Pb 2. The half-life for the decay of 222Rn gas is about 3.8 days. If we started with one mole of 222Rn gas, how many days (to the nearest 1/10th of a day) would it take until...
If a container of radioactive isotope has a half-life of 10 years, how many years will it take for there to only be 25% of the isotope remaining in the container.
Calculating Absolute Ages: Daughter Isotope Lead-210O Polonium-218 Xenon-131 Yttrium-90 Nitrogen-14 Uranium-235 Thorium-231 Thorium-234 Half Life [approximate] 0.00016 seconds 4.0 days Type of Decay Parent Isotope Polonium-214 Radon-222 lodine-131 Strontium-90 Carbon-14 Plutonium-239 Uranium-235 Uranium-238 Alpha Beta Beta Beta 8.0 da 30.0 years 5,730 years 24,000 years 704,000,000 years 4,500,000,000 years Alpha Alpha A meteorite from Mars is found on the surface of a glacier in Antarctica. You take it back to the lab and measure 96.875 grams of Thorium-231 for every...
A moon rock collected by the Apollo Mission is estimated to be 3.80 billion years old by uranium/lead dating. Assuming that the rock did not contain any lead when it was formed, what is the current mass of 206Pb in the rock, given that it currently contains 1.180 g of 238U? The half-life of 238U is 4.47×109 years. Report your answer in grams. HINT: The decay process is 238U → 206Pb, you will need to account for the differences in molar mass...