College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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## Half Life

The half-life of a substance is the time required for half the nuclei to undergo radioactive decay.

### (a) Tritium has a half-life of 12.33 years. What percentage tritium nuclei in a sample will decay in 5 years?

### (b) At time \( t = 0 \), a radioactive sample contains \( 30.0 \times 10^{-15} \) kg of \( ^{108}_{47} \text{Ag} \), which has a half-life of 2.42 minutes. What is the activity of this sample in becquerels (Bq) and millicuries (mCi)?
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Transcribed Image Text:## Half Life The half-life of a substance is the time required for half the nuclei to undergo radioactive decay. ### (a) Tritium has a half-life of 12.33 years. What percentage tritium nuclei in a sample will decay in 5 years? ### (b) At time \( t = 0 \), a radioactive sample contains \( 30.0 \times 10^{-15} \) kg of \( ^{108}_{47} \text{Ag} \), which has a half-life of 2.42 minutes. What is the activity of this sample in becquerels (Bq) and millicuries (mCi)?
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