30_InstSolManual_PDF_Part14 - 30-14 Chapter 30 nT1/2 is A 1...

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30.56. Set Up: In one the number of radioactive nuclei halves. If the number at is the number after is Solve: (a) 2.0 min is one for so 2.0 min is four for so (b) 30.57. Set Up: A nucleus has mass Solve: (a) (b) Reflect: The half-life is very long, so the number of decays per second is small. 30.58. Set Up: The activity The mass of one nucleus is In a time of one half-life the number of radioactive nuclei and the activity decrease by a factor of 2. Solve: (a) (b) 68 days is so the activity is 30.59. Set Up: A nucleus has mass Solve: (a) (b) (c) (d) 1 1.66 3 10 12 2 1 1 Ci 3.70 3 10 10 decays / s 2 5 44.9 Ci P D N D t P 5 l N 5 1 4.15 3 10 2 9 s 2 1 21 3.99 3 10 20 2 5 1.66 3 10 12 decays / s N 5 0.0400 3 10 2 3 kg 60 m p 5 4.00 3 10 2 5 kg 60 1 1.67 3 10 2 27 kg 2 5 3.99 3 10 20 l 5 ln 2 T 1 / 2 5 ln 2 1.67 3 10 8 s 5 4.15 3 10 2 9 s 2 1 1 Ci 5 3.70 3 10 10 decays / s. 60 m p . 60 Co T 1 / 2 5 5.3 yr 5 1.67 3 10 8 s. l 5 ln 2 T 1 / 2 . P D N D t P 5 l N . 1 6.8 3 10 14 Bq 2 / 2 4 5 4.2 3 10 13 Bq 4 T 1 / 2 0 D N / D t 0 5 1 4.7 3 10 2 7 s 2 1 21 1.45 3 10 21 2 5 6.8 3 10 14 Bq N 5 0.250 3 10 2 3 kg 103 m p 5 1.45 3 10 21 l 5 ln 2 T 1 / 2 5 ln 2 1 17 days 21 24 h / day 21 3600 s / h 2 5 4.7 3 10 2 7 s 2 1 103 m p . 103 Pd l 5 ln 2 T 1 / 2 . 0 D N / D t 0 5 l N . 1 15.4 decays / s 2 1 1 Ci 3.70 3 10 10 decays
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Unformatted text preview: decays / s 2 5 4.16 3 10 2 10 Ci P D N D t P 5 l N 5 1 1.72 3 10 2 16 s 2 1 21 8.98 3 10 16 2 5 15.4 decays / s. N 5 6.00 3 10 2 9 kg 40 m p 5 6.00 3 10 2 9 kg 40 1 1.67 3 10 2 27 kg 2 5 8.98 3 10 16 . l 5 ln 2 4.04 3 10 15 s 5 1.72 3 10 2 16 s 2 1 . 1 Ci 5 3.70 3 10 10 decays / s. 40 m p . 40 K T 1 / 2 5 1.28 3 10 8 yr 5 4.04 3 10 15 s. l 5 ln 2 T 1 / 2 . P D N D t P 5 l N . N 15 N 19 5 N / 2 5 N / 2 20 5 2 15 5 3.3 3 10 4 . N 19 5 A 1 2 B 20 N . N 15 5 A 1 2 B 5 N . n 19 5 20. n 15 5 5. N 15 N 19 5 N / 2 N / 16 5 8.0. N 19 5 A 1 2 B 4 N 5 N / 16. N 15 5 A 1 2 B 1 N 5 N / 2. n 19 5 4. 19 O, T 1 / 2 n 15 5 1. 15 O, T 1 / 2 A 1 2 B n N . nT 1 / 2 N , t 5 T 1 / 2 30-14 Chapter 30...
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  • Spring '07
  • Shoberg
  • decays

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