The isotope given below has a half-life of 1.01 yr. What mass (in mg) of a 2.00−mg sample will remain after 3.75 × 103 h?
212 Bi 83
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The isotope given below has a half-life of 1.01 yr. What mass (in mg) of a...
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...
14C decays by emitting a β- particle. This decay process has a half-life of 5.72×103 yr. Answer the following questions about this process and report all answers to three significant figures. A. Determine the initial activity (in dis/yr) of a 5.81 mg sample of this isotope. B. Determine the time (in yr) that it takes for the activity of 14C to decrease to 8.39×107 dis/yr.
V Question 5 3.03 pts Suppose a radioactive isotope has a half-life t% = 99.1 hr. How long will it take for a sample of the isotope to decay to 3.0% of its original activity? a. 218 hr b. 0.0354hr c. 348 yr d. 297 hr e. 501 hr O a Ob Ос Question 6 3.03 pts A radioactive isotope has a half-life, t% = 27.3 yr How long will it take for a 3.27 mCi sample of this isotope...
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 Cs-137 has a half-life of 30 years. Starting with 1.0 mg of Cs, how much would remain after 90 years?
A radioactive sample contains 1.55g of an isotope with a half-life of 3.7 days.Part A:What mass of the isotope will remain after 5.8 days? (Assume no excretion of the nuclide from the body.)Express your answer using two significant figures.
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
Tutored Practice Problem 15.4.7 C Use half-life to calculate mass remaining for radioactive decay Close P The radioactive isotope - Al has a half-life of 7.20 seconds. If a sample contains 25,3 mg of SA, what mass of the isotope will remain after 14.3 seconds? Check & Submit Answer Show Approach
Radium-226. a radium isotope, has a half-life (the time it takes half of the isotope to decay) of about 1620 years. A sample of radium-226 has a mass of 30 grams. Which of the following equations expresses the number of grams, g, of this sample that will be left after tyears? OA 1620 9= 30 -15.00 OB oc 9 = 30 - 157620 OD 9=301620
Questions 3.03 Suppose a radioactive isotope has half-life-99.11. How long will take for a sample of the Isotope to decay to 3.0% of its originaltivity? a 2181 b. 0.0354h C348 yr d. 297 h e. 501 he Oь Od Od O. Question 303 A radioactive stope has halte-273 How long will be for 3.27 mmple of the Isotope to decay to 0.351 CIT 00817 y 382 y 133 y d. 87.9 y 6.60.9 y O. Оe Question 7 3.03 pts...