30. What are the Z and N values for ? in the fission reaction Un 92 55 Cs+4n? A. Z 55 and N = 37 = B. Z 37 and N = 55 = C. Z 35 and N = 58 = D. Z 92 and N = 37 = E. Z 37 and N = 92 =
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- 50 Write the complete nuclear equation for atoms undergoing electron capture. 901 Ag + L47 116. Sn + 78 123 53The radium isotope 226 Ra has a hall-life of 1600 years. A sample begins with 3.50x1010 226 Ra atoms. Y Part C N Submit How many are left after 400 years? 195] ΑΣΦ Submit Request Answer Part B How many are left after 2000 years? N= 1971 ΑΣΦ Submit How many are left after 35000 years? Request Answer ΜΕ ΑΣΦΑ Request Answer BAC ? ?5. A sample of protactinium -234 of mass 100 g has a half-life of G-7 hours. A. what praction of the sample has not decayed after 20-1 hours? B. What is the mass of undecayed protactinium -234 after this period of time...
- 32NE decays by B decay. Which of these is the correct reaction? 10 Select one: of 1 O a. 3 Ne B + 3F 10 1. tion O b.Ne → °B+ 3}F 10 O c. Ne → _°ß+ {Na B+Na. 32 11 10 O d. Ne B+ Na 33 Na 08 10 2 The half-life of 2 U is 70 years. How long would it take for all but 2322. The decay constant, Ai, for the a transition of 243 Am95 () to the various levels of 239NP93 may be estimated from In 1= 48.4 + 2.97 R½ Z¼ - 3.97 Z/T« - 660 o = 0.002la(la+1) where Z is the atomic number of the daughter nucleus, R is the radius of the daughter nucleus in femtometers and approximated by R=1.2XA3, Ta is the kinetic energy of the a - particle in MeV and la is the angular momentum carried by the a- particle. a. Calculate the branching ratio of the 3 transitions. b. Estimate the mean lifetime of the 243Amº5 5- c. The transition from the 239N%93 () to the state proceeds either directly by gamma emission or by gamma emission to the state first or by internal conversion of K-electron, with a conversion coefficient of 2. Use Weisskopf estimates to calculate the lifetime of the 9- excited state.