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Lesson_5.2_Homework - 7 A particular radioactive sample is...

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Lesson 5.2 Homework 1. Write the nuclear equations expressing (i) the beta decay of 60 27 Co , (ii) the alpha decay of 226 88 Ra 2. Write the nuclear equations for (i) alpha decay of neptunium-237, (ii) the negative beta decay of phosphorus-32, (iii) the positive beta decay of cobalt-56. 3. Tritium is radioactive. (i) Would you expect it to be a β + or β - decay? (ii) What is the daughter nucleus? Is it stable? 4. Bismuth-210 decays by emitting an alpha particle followed by a beta particle, ending in lead-206. Write the nuclear equations for these decay processes. 5. Complete the following nuclear equations 238 234 92 90 40 40 19 20 23 11 22 22 11 10 ( ) _____________ ( ) _____________ ( ) _____________ ( ) _______ i U Th ii K Ca iii Na iv Na Ne γ + + + + 6. In three half-lives, the activity of a radioactive sample will decrease by what percent?
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Unformatted text preview: 7. A particular radioactive sample is observed to undergo 1.25 × 10 6 disintegrations per second. What is the activity of this sample (i) in Bq, (ii) in Ci? 8. At a given time, a radioactive beta source has an activity of 40 mCi. Assuming that one beta particle is emitted per decay, how many are emitted per minute? 9. A sample of technetium-104 has an activity of 10 mCi. If its half-life period is 18 minutes, estimate the activity after one hour. 10. A soil sample contains 40 μg of 90 Sr. Approximately how much 90 Sr will be in the sample 100 years from now? 11. A sample of old bone is found to have 4 beta decays per minute for each gram of carbon. Approximately how old is the bone?...
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