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Uranium-235 has a half-life of 7.04 x 108 years. How many years will it take for...
Problem 2(10 points): The natural composition of uranium and the half-life of the isotopes are given below in the table. Isotope |At90 Half-life (vrs) U-234 0.005% 2.455 x 10 0.711% 17.038 x 108 U-23899.284% 4.468 x 109 U-235 Assume earth was formed 4.54 x 109 years ago. The ratio of U-235 to U-238 has been steadily decreasing since than. (a) Calculate the enrichment of U-235 (in atom percent) at the time of formation of the earth (t=0) (b) Calculate the...
Part A A rock contains 0.102 mg of lead-206 for each milligram of uranium-238. The half-life for the decay of uranium-238 to lead-206 is 4.5 109 yr. The rock was formed years ago. 5.02. 108 3.81 108 7.23.108 4.59 108 5.49. 108 Request Answer Submit If we start with 1.000 g of strontium-90, 0.887 g will remain after 5.00 yr. This means that the half-life of strontium-90 is yг. 28.8 4.43 41.6 3.91 5.64 Request Answer Submit
Isotope X has a half-life of 9.30 years. How long will it take for a 51.4 mg sample of X to decay to 0.415 mg? 69.1 Years 20.1 Years O 61.5 Years 0 64.7 Years O 89.0 Years
1. If hydrogen-3 has a half-life of 12.3 years, how many years will it take for 109.9 mg 3H to decay to 0.013 mg 3H?
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 half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration. a) How long will it take for 17 % of the U−238 atoms in a sample of U−238 to decay? Express your answer using two significant figures and in yrs b) If a sample of U−238 initially contained 1.8×1018 atoms and was formed 4.9 billion years ago, how many U−238 atoms does it contain today? Express your answer using two significant figures.
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...
Radioactive plutonium 239Pu decays to 235U with a half-life of 2.44 x 104 years. How long (in years) must a sample of 239Pu be stored until the amount has decreased by a factor of 106? A. 5.23 x 106 B. 2.44 x 105 C. 4.86 x 105 D. 3.27 x 105 E. 3.07 x 106
The half-life for the radioactive decay of C-14 is 5730 years. How long will it take for 25% of the C-14 atoms in a sample of C-14 to decay. If a sample of C-14 initially contains 1.5 mmol of C-14, how many mmols will be left after 2255 years.
(d) Due to alpha decay, l mole of uranium-238 produces 2.96 106 alpha particles per second. Find the half-life, giving your answer in units of years. [5 marks] (e) The average mass of the atoms in a 0.100 kg block of pure carbon is 12.01 u. A small fraction of the atoms are radioactive, with a decay constant of 3.90 x 10-12s. If the activity of the carbon block is 97.8 Bq, calculate what fraction of the atoms are radioactive...