12455 Cs has a half-life of 30.8 seconds.a) If we have 9.7 µg of Cs initially, how many Cs nuclei are present initially?b) How many Cs nuclei are present 2.9 minutes later?c) What is the “activity” (decay/time) at this time (2.9 minutes after initial conditions)?

12455 Cs has a half-life of 30.8 seconds.a) If we have 9.7 µg of Cs initially, how many Cs nuclei are present initially?b) How many Cs nuclei are present 2.9 minutes later?c) What is the “activity” (decay/time) at this time (2.9 minutes after initial conditions)?

Modern Physics

3rd Edition

ISBN:9781111794378

Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Chapter13: Nuclear Structure

Section: Chapter Questions

Problem 32P

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Question

124
55 Cs has a half-life of 30.8 seconds.
a) If we have 9.7 µg of Cs initially, how many Cs nuclei are present initially?
b) How many Cs nuclei are present 2.9 minutes later?
c) What is the “activity” (decay/time) at this time (2.9 minutes after initial conditions)?

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