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Homework-15-solns

# Homework-15-solns - Homework 15 Chapter 32 SOLUTIONS...

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Homework 15 – Chapter 32 – SOLUTIONS QUESTION 1 Identify Z, N and A of the following nuclei. SOLUTIONS a) Hg 80 202 Z  = 80,  N  = 122,  A  = 202 b) Rn 86 220 Z  = 86,  N  = 134,  A  = 220 c) Nb 41 93 Z  = 41,  N  = 52,  A  = 93 (note: this is Nb rather than Hg as stated in the problem) QUESTION 2 The half-life of iodine-131, an isotope used in the treatment of thyroid disorder, is 8.04 d. a) If a sample of iodine-131 contains 3.9 x 10 16  nuclei, what is the activity of the sample? (Express your answer in curies, where 1 Ci = 3.7 x 10 10  disintegration/s.) b) f the half-life of iodine-131 were only half of its actual value, by what factor will would the activity be? SOLUTIONS a) Activity: R = N = 0.6931 t 1 / 2 N = 0.6931 8.04 d  86400 d 3.9 × 10 16 R =  3.891 x 10 10  s -1  = 1.052 Ci b) If  t 1/2   were halved in the above formula, the activity,  R . would  double.

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Homework-15-solns - Homework 15 Chapter 32 SOLUTIONS...

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