1.\tState the meaning of the term \u2018half-life\u2019.<\/p>\n
2.\tThe activity of a radioactive sample decreases from 4000 counts per minute (c.p.m.) to 125 c.p.m. over a period of 40 minutes. Calculate the half-life of the source?<\/p>\n
3.\tA radioactive source has a half-life of 8 hours. If the source has an initial activity of 32\uf020000 Bq, find its activity after 2 days.<\/p>\n
4.\tA radioactive sample has a half life of 2 days. Calculate the time it will take for its activity to drop to one sixteenth of its original value.<\/p>\n
5.\tA radioactive isotope has a half-life of 15 hours. 256 g of the isotope is placed in a sealed container. What mass of the isotope will remain radioactive after
\n60 hours?<\/p>\n
6.\tA radioactive isotope contains 640 million atoms of the isotope. How many isotope atom s will remain after 6 half-lives have passed?<\/p>\n
7.\tA radioactive rock with a half life of 8000 years has an activity of 20 MBq. What will be the activity after 40\uf020000 years?<\/p>\n
8. \tA radioactive tracer is delivered to a hospital. If it has an initial activity of 2000Bq and decays to 250Bq in 36 minutes, calculate the half life of the tracer.<\/p>\n
9.\tA radioactive source has a half life of 2 minutes. If it decays for 20 minutes and it\u2019s final activity is 3Bq- what was it\u2019s in intial activity?<\/p>\n
10. \tThe initial activity of a source is 240 cpm and it has a half life of 3 days. What will its final count be , if it decays for 12 days?<\/p>\n","protected":false},"excerpt":{"rendered":"
1. State the meaning of the term \u2018half-life\u2019. 2. The activity of a radioactive sample decreases from 4000 counts per minute (c.p.m.) to 125 c.p.m. over a period of 40 minutes. Calculate the half-life of the source? 3. A radioactive source has a half-life of 8 hours. If the source has an initial activity of … Continue reading PPP Exercise 6E<\/span>