Q3(a) The half-life of a particular radioactive isotope is 6.5 h. If there are initially 48x 1019 atoms of this isotope, how many atoms remain at the end of 26 h?
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A: You are using incorrect symbol for Tau (decay constant).
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Q: 5. Krypton-85 is an inert radioactive noble gas with a half-life of approximately 10.76 years. a.…
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A: To the nearest hour, the radioactive half-life of the substance is 52.5hours
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- 5. Krypton-85 is an inert radioactive noble gas with a half-life of approximately 10.76 years. a. Write an exponential function to model this situation and define each variable. ( b. Determine what fraction of a sample of Krypton-85 will remain after 86.08 years. State the answer as an exact fraction value. ( C. Determine how long will it take for a sample of Krypton-85 to decay to 1/64 of its original mass. Round your answer to the nearest hundredth of a year.5. Krypton-85 is an inert radioactive noble gas with a half-life of approximately 10.76 years. a. Write an exponential function to model this situation and define each variable. ( b. Determine what fraction of a sample of Krypton-85 will remain after 86.08 years. State the answer as an exact fraction value. ( C. Determine how long will it take for a sample of Krypton-85 to decay to 1/64 of its original mass. Round your answer to the nearest hundredth of a year.Please do it quickly!
- The half-life of a particular radioactive isotope is 6.5 h. If there are initially 48 * 1019 atoms of this isotope, how many remain at the end of 26 h?Tritium, the hydrogen isotope of mass 3, has a half-life of 12.3 y. What fraction of the tritium atoms remains in a sample after 50.0 y?How many days The half-life of a radioactive isotope is 140 d. would it take for the decay rate of a sample of this isotope to fall to one-fourth of its initial value?
- A pure sample of a newly discovered radioactive isotope is discovered. It has a half-ife of S9 min. Determine how long until only 1/16 of the original amount remains,Plutonium-239 (atomic number 94) is a by-product of nuclear power plants. It decays via alpha and gamma decay. The half-life for the decay is 24100 years. What is the decay constant for Pu-239 expressed in inverse years and inverse seconds? If the sample of Pu-is measured to have an activity of 150 decays per second today, how many years would it take for the sample to reduce to an activity of 5 decays per second? How many Pu-239 nuclei are in the sample measured today?A sample of carbon-14 initially consists of 5 × 10 24 particles. Carbon-14 has a half- life of 5730 years. a. What is the decay constant for carbon-14? (Answer in units of yr –1 .) b. How many radioactive particles of the sample remain after 100 years? c. What percentage of the radioactive particles remains after 500 years? d. How many radioactive particles of the sample remain after 1000 years? e. How much time will it take for 50% of the particles to decay? f. How much time will it take for 99% of the particles to decay? g. How many half-lives will it take for 99% of the sample to decay? h. What is the initial decay rate of the sample? (Answer in decays/yr.) i. After 200 years, what is the decay rate of the sample? j. How long will it take for the decay rate to decrease to 1015 decays/year? k. How many half-lives have passed after the time you found in part (j)?
- Solve problem 17 by using equation (2,2) and the k value determined by solving 16.the decay of a radioactive material has a count rate is 2000 decays/min. 4 hours later, the decay rate is 500 counts/min. what is the half-life?The radioactive isotope of lead ^209Pb decays according to the differential equation dN/dt=-kN. The isotope has a half-life of 3.3 Hours. If 1 gram is presented initially, how long will it take for 78% of the lead to decay?