A radioactive material has a half-life of 2.5 hours. The activity of a sample was measured to be 375 cps. What was the activity of the sample 6 hr, 15 min earlier? a. 60 cps b. 2.1 × 103 cps c .66 cps d. 8.6 × 102 cps e. 4.9 × 103 cps

A radioactive material has a half-life of 2.5 hours. The activity of a sample was measured to be 375 cps. What was the activity of the sample 6 hr, 15 min earlier? a. 60 cps b. 2.1 × 103 cps c .66 cps d. 8.6 × 102 cps e. 4.9 × 103 cps

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter30: Nuclear Physics

Section30.3: Radioactivity

Problem 30.3QQ

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Question

A radioactive material has a half-life of 2.5 hours. The activity of a sample was measured to be 375 cps. What was the activity of the sample 6 hr, 15 min earlier?

a. 60 cps

b. 2.1 × 10³ cps

c .66 cps

d. 8.6 × 10² cps

e. 4.9 × 10³ cps

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