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V Question 5 3.03 pts Suppose a radioactive isotope has a half-life t% = 99.1 hr....
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...
for C. Sample 3.27m 6. How long will it talke isotope radioactive to .351 mei for decay with a til = 27.3 yr 9..0817 b. 38.2 C. 133 d. 81.9 c. 60.9 7. If rachioactive isotope with 9 43.7 my sample of a = 27.3 yr decays for 6. 18 yr how many mg are lett. a0267 my b. 1722 C 30.5 cl. 37.4 e. 34.9 34.9 mg
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
The half-life of a radioactive isotope is 220 d. How many days would it take for the decay rate of a sample of this isotope to fall to 0.47 of its initial rate?
If a radioactive isotope has half-life h, then the number of atoms in a sample is given by a(t)=a-2-/h where ao gives the number of atoms in the sample at time 0. The radio active decay of carbon-14 leads to clever way of determining the age of fossils and remnants of plants and animals. When an organism dies, the radioactive carbon- 14 in it decays, with half of it gone in 5,730 years. a. Suppose a mummified cat has a...
Question 4 1 pts A particular radioactive isotope has a half-life of 2.90 weeks. What fraction of the original sample is left after 101.5 days? 1/8 1/64 1/32 1/16 none of these Next
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
9. [-14 Points] DETAILS SPRECALC7 4.6.017. This exercise uses the radioactive decay model. The half-life of radium-226 is 1600 years. Suppose we have a 28-mg sample. (a) Find a function m(t) = moz-th that models the mass remaining after t years. m(t) = (b) Find a function m(t) = moet that models the mass remaining after t years. (Round your value to six decimal places.) m(L) = (c) How much of the sample will remain after 2500 years? (Round your...
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.
Question 18 0 out of 1 points A radioactive isotope decays with a half-life of 8.02 minutes. If a sample of the isotope initially contains 5.00 g, what mass remains after 6.01 minutes? Selected Answer. 3.13 g Answers 2.979 1.139 1.87 g 3.139