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Calculation Exercise c8

This document contains 9 calculation exercises involving radioactive decay and half-lives. The exercises ask the reader to calculate amounts of radioactive substances left after certain periods of time based on given half-lives, determine the number of half-lives that will elapse for a sample to decay to a certain amount, and calculate original sample amounts and half-lives based on the data provided.

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julia ahmad
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140 views3 pages

Calculation Exercise c8

This document contains 9 calculation exercises involving radioactive decay and half-lives. The exercises ask the reader to calculate amounts of radioactive substances left after certain periods of time based on given half-lives, determine the number of half-lives that will elapse for a sample to decay to a certain amount, and calculate original sample amounts and half-lives based on the data provided.

Uploaded by

julia ahmad
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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CALCULATION EXERCISE (CHAPTER 8)

1. The half-life of radon-222 Is 3.8 days, How much of a 2. Carbon-14 has a half-life of 5,730 years. If a sample
100 g sample is left after 15.2 days? contains 70 mg originally, how much is left after
17,190 years?

3. How many half lives will it take for 50 g of Tc 99 to decay 4. An isotope of cesium (cesium-137) has a half-life of 30
to 6.25 g? years. If 1,0 g of cesium-137 disintegrates over a
period of 90 years, how many g of cesium-137 would
remain?

5. The half-life of isotope X is 2 years. How many years 6. What is the half-life of a radioactive isotope if a 500 g
would it take for a 4 mg sample of X to decay and have sample decays to 62.5g in 24.3 hours?
only 0.50 mg of it remain?

7. 100 g of Au-198 decays to 6.25 g in 10.8 days, what is 8. The half-life of cobalt-60 is 5.26 years. If 50 g are left
the half-life of Au-198? after 15.8 years, how many grams were In the original
sample?

Time (minutes) 0 20 40 60 100 120


Activity (Bq 1200 800 560 400 280 200
9. The activity of radioactive substance K against time is shown in Table below.

(a) Draw a graph of activity against time on a piece of graph paper.


(b) Based on the graph, what is the half-life of Q?

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