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4. A newly discovered isotope was found to have a half life of 30 minutes. How...
An isotope of cesium (Cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain? 14. Thallium-208 has a half-life of 3.053 min. How long will it take for 120.0g to decay to 7.500 15. Element-106 has a half-life of 0.90 seconds. If one million atoms of it were prepared, how many atoms would remain after 4.5 seconds? 16. A 2.5 gram sample of an...
The radioactive isotope Cs-137 has a half-life of 30 years. Starting with 1.0 mg of Cs, how much would remain after 90 years?
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 of antimony-131 is first order with a half life is 23.03 minutes. How much of 1.4228 g sample would remain after 1.368 hours?
A Radioactive sample contains 2.1g of an isotope with a half- life of 3.8 days. How much of the isotope in grams will remain after 10.0 days? Express the answer to 3 significant figures.
Strontium-90 has a half-life of 28.1 years. Starting with 3.2 mg of this isotope, how much would remain after 112.4 years?
The radioactive isotope, Fr - 223, has a half-life of 22 minutes. How many minutes will it take for an original sample to decay to 12.5% of its original amount? Express your answer in minutes. Enter only the numeric value of the answer without the units.
The half-life of nitrogen-13 is approximately 9.97 minutes. How much of a 3 gram sample of nitrogen-13 would remain after 8 minutes? Round to three decimal places
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
If the half life of an isotope is 6 days and 120 grams of the isotope is initially available, how many grams of the isotope remains after 30 days? 0.94 grams 7.5 grams 3.75 grams 1.87 grams