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A sample of a material has radioactive particles in it today. Your aunt measure radioactive particles in it years ago.

A. years from today, how many radioactive particles will the sample have?

B. years from today, how many radioactive particles will the sample have?

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Related questions

15.57 The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration. How long will it take for 20% of the U−238 atoms in a sample of U−238 to decay? Express your answer using two significant figures. If a sample of U−238 initially contained 1.1×1018 atoms when the universe was formed 13.8 billion years ago, how many U−238 atoms will it contain today? Express your answer using two significant figures.

Initially, a particular sample has a total mass of 160 grams and contains 256 x 1010 radioactive nuclei.These radioactive nuclei have a half life of 1 hour.

(a) After 3 hours, how manyof these radioactive nuclei remain in the sample (that is, how manyhave not yet experienced a radioactive decay)? Note that you can dothis problem without a calculator.


ANSWER:32 x 1010 radioactive nuclei


(b) After that same amount of time has elapsed, what is thetotal mass of the sample, to the nearest gram?

_______________grams



Need answer to (b)

Radon gas produces radioactive particles and in high concentrations can result in lung cancer in humans. The radon gas level inside a basement is measured at 4.5 x 10^-4 Curies/cm^3. How many picoCuries of radon are present in the room if the room's dimensions are 7.2m x 8.5m x 4.0m?

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