A radioactive sample has an initial activity of 3.5 mCi (millicuries). Its activity 11 hours later is 1.9 mCi. What is its half-life

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A friend of yours has recently read a story on the Web that eating a broccoli should be avoided because broccoli contains potassium which has radioactive isotope K-40. As a consequence of reading this story, she has been telling you and others not to eat broccoli. Is eating broccoli, indeed, a radioactive hazard to your health? Determine the activity (in Bq or mCi) for a typical serving of broccoli which contains about 300 mg of potassium. Note that the natural abundance of K-40 is .0117% and its half life is T1/2=1.248E9 yr. Assuming the average radiation energy released per decay is 480keV, what is the maximum energy absorbed into one's body over 30 days, the time for 50% of the potassium-40 to be eliminated the body biologically. Do you agree with your friend that eating broccoli is a radioactive health risk?

26. A radioactive material initially is observed to have anactivity of 1 000 decays/sec. If three hours later it is observedto have an activity of 125 decays/sec, what is its half-life?
a. 1/2 hour b. 1 hour c. 3 hours d. 8 hours

A radioactive material initially is observed to have an activity of1,000 decays/sec. If three hours later it is observed to have anactivity of 125 decays/sec, what is its half-life?
The answer is 1 hour, but I don't understand how to do thisproblem?

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A radioactive sample has an initial activity of 3.5 mCi (millicuries). Its activity 11 hours later is 1.9 mCi. What is its half-life

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Physics: Principles with Applications

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