a) in ten days the radioactivity of cerium-141 is reduced by 19.3%. what is the half time?(- In2)/In(a))
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- an element with initial mass 1 kg started radioactivity in 2021 , in which year the element will lose 0.5 kg ? knowing that the decay constant for element is 693.147*10^-5 / year4. 500 mCi sample of radioisotope was purchased by a medical supply house. If the sample has the half-life of 15 days. How long will it keep before it's activity is reduced to 25 mCi ?You find a 37.2 g fossilized bone that has an activity of 0.024 counts per second. How old is the bone? Please give your answer in years.
- iodine 131 has a half life of 8.04 days if you start with a radioactivr I 131 sample having an activity equal to 40 microci after how long is the activity going to be 4cmicrociA sample of radioactive material has a half-life of 12 hours. If the initial sample contained 6.2x10¹3 radioactive nuclides estimate the number of radioactive nuclides present in the sample after 5 hours.3. (a) Calculate the decay constant for cobalt-60 (T1/2 = 5.26 Years) in units of week-¹ (b) Calculate the activity of a 5000-Ci cobalt-60 source after 10 years.
- 18) What is the remaining amount of radioactivity when the Starting amount is 15.5-g and there was 4.35 half- lives.A radioactive sample has an activity R. For each of the following changes, indicate whether the activity would increase, decrease, or remain unchanged. HINT Relate the sample's activity R to each of the quantities being changed. Click the hint button again to remove this hint. (a) The number of radioactive nuclei in the sample is doubled. O The activity would increase. O The activity would decrease. O The activity would remain unchanged. (b) The half-life of the radioactive nuclei is doubled. O The activity would increase. O The activity would decrease. O The activity would remain unchanged. (c) The decay constant is doubled. O The activity would increase. O The activity would decrease. O The activity would remain unchanged. (d) A time period equal to two half-lives is allowed to elapse. O The activity would increase. O The activity would decrease. O The activity would remain unchanged.Please both