3 of 6 Question A6 A nucleus of 78 Kr undergoes a double -capture decay. a) Write down the decay equation. b) For a general double -capture decay, starting from an expression of the Q-factor in terms of nuclear masses derive an expression of Q in terms of atomic masses. c) Calculate the Q-factor of the 78 Kr decay.
Q: Part A A sample of U (T1=1.59 × 10° yr) contains 6.10 × 1018 nuclei. Part B Approximately how many…
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- Given the mass of a radioactive material, phosphorus 32P is 0.60 g and its half-life, T1/2 is 14.3 days. i) What is the initial number of nuclei of 32P? ii) Determine the number of remaining nuclei of 32P after 20 days iii) What is its activity after 20 days? iv) Calculate the time taken for its activity to reduce to one decay per second.e) The nucleus16 B(Z=5)has not been detected in nuclear reaction studies. Explain why. (Please type answer no write by hend).The most common isotope of uranium 23 U has a half-life of 4.47 x 10⁹ years, decaying to 92 234 Th by a emission. i) ii) iii) iv) Write down the nuclear decay equation. What is meant by the decay constant? Calculate the mass of uranium would be required for an activity of 6.00 µμCi. Calculate the number of a particle emitted per second by 30.0 g of uranium. [1 Ci = 3.70 x 10¹⁰ decays/s]
- Example 6: A test tube of an isotope having a decay constant of 0.765 x 10-6 s-1 contains 3.0 x 1017 nuclei of this isotope. (a) What is the half-life of this isotope? (b) What is the initial activity (in Bq) of the isotope? (c) What is the activity of the isotope after 12 days?10. The radioactive isotope (82Sr) has a half-life of 25.4 days. A sample containing this isotope has an initial activity at (t = 0) of 4.50 × 108 Bq. Calculate the number of nuclei that will decay in the time interval between t₁ = 80.0 hours. for ssi nuclei ssf624 50 ssfo 30.0 hours and t2 sf60 s 60 ssf6Radon gas has a half-life of 3.83 days. If 2.92 g of radon gas is present at time t = 0, what mass of radon will remain after 2.20 days have passed? g
- c) Complete the following decay reaction to show sodium-24 undergoing ߯ decay. First identify the unknown daughter nucleus (?).. and then name the subatomic particle that completes the reaction. 24Na → (?) + v + (subatomic particle) Enter the mass number A = Enter the atomic number Z = Enter the chemical symbol: Name the subatomic particle: A/ NAn ancient artifact is found to contain 240 g of carbon and has an activity of 479 decays/min. Part A Q Search What is the approximate age of the artifact, to the nearest thousand years? (The rate of decay of carbon in living matter is R 16 decays/(g. min).) Express your answer to the nearest thousand years. 15| ΑΣΦ Submit Part B What would its initial activity have been? Ro= Request Answer 15. ΑΣΦ P Pearson W ? ? y Copyright © 2022 Pearson Education Inc. All rights reserved. | Terms of Use | Privacy Policy | Permissions | Contact Us | decays/min Revie 10:02 AM 12/12/2022Part A A sample of U (T1= 1.59 × 10° yr) contains 2 233 6.10 x 1018 nuclei. What is the decay constant? Express your answer using three significant figures. ? = s-1 II
- 1. What is the binding energy per nucleon for ?? 1327 (Aluminum – 27)? Note: A neutral ?? 1327(Aluminum – 27) atom has a mass of 26.981539 u; a neutral hydrogen atom has a mass of 1.007825 u; a neutron has a mass of 1.0086655 u; and a proton has a mass of 1.007277 u. Also, 1 u = 931.494 MeV/c2.a. 8.3 MeVb. 6.7 MeVc. 5.4 MeVd. 3.4 MeVe. 2.8 MeVplease solve question 3A 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)?