The half-life of Thorium-231 is 25.5 hours. What is the rate constant of this decay?
The half-life of Thorium-231 is 25.5 hours. What is the rate constant of this decay?
Thorium (with half-life T1/2 = 1.913 yr. and atomic mass 228.0287 u) undergoes alpha decay and produces radium (atomic mass 224.0202 u) as a daughter nucleus. (Assume the alpha particle has atomic mass 4.002603 u.) 1) What is the decay constant of thorium? (Note that the answer must be in units of hrs-1.) λ = 2) What percent of thorium is left after 200 days? 3) The energy released from the decay of 10 g of thorium is used to...
the half life of Tl-201 is 73.1 hours. what's the decay constant?
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...
The radioactive isotope thorium 234 has a half-life of approximately 578 hours. (a) If a sample has a mass of 67 milligrams, find an expression for the mass after t hours. Q(t) = 67e-0.0011997 (b) How much will remain after 85 hours? (Round your answer to one decimal place.) 60.5 mg (c) When will the initial mass decay to 20 milligrams? (Round your answer to one decimal place.) 1008.3 x hr
What is the rate constant for the decay of Bi-210 if the isotope's half-life is 5.0 days? O A. 0.20 days? OB. 0.20 days O C. 0.14 days OD. 0.14 days?
Question 8 What is the relationship between the rate constant and the half-life for nuclear decay? In (2) k = 1112 ok= ln (0.69311/2) rate = kt12 ok=0.693112 In (0.693) 11 12
The half-life of radon-222 is 3.823 days. What is the rate (decay) constant of this isotope? (Report your answer in standard notation. Only include the number in the answer box.) k = ?????? day-1
8. The half-life of thorium-227 is 18.72 days. How many days are required for three-fourths of a given amount of thorium-227 to decay?
1. a certain isotope has a half life of 24.3 minutes. what is the decay constant (in s^-1) of this isotope? 2. You are told that a room contains an isotope with a half-life of 1.5 hours. If you need to wait until the isotope has decayed to 15% of its initial activity before entering the room, how long (in hours) must you wait
The decay constant of a given nucleus is 4.9×10?5 s?1 . What is its half-life? Answer is in hours.