40 The count rate measured when near a radioactive source drops from 542 counts per minute to 94 counts per minute in 12 hours. The background count remains constant at 30 counts per minute. What is the half-life of the source? A 2 hours B 3 hours C 4 hours D 8 hours OA OB Oc OD

40 The count rate measured when near a radioactive source drops from 542 counts per minute to 94 counts per minute in 12 hours. The background count remains constant at 30 counts per minute. What is the half-life of the source? A 2 hours B 3 hours C 4 hours D 8 hours OA OB Oc OD

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 33P

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40 The count rate measured when near a radioactive source drops from 542 counts per minute to
94 counts per minute in 12 hours. The background count remains constant at 30 counts per
minute.
What is the half-life of the source?
A 2 hours
B
3 hours
4 hours
D
8 hours
A
В

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