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Sr-90 has a half-life of 29 years. If the final sample after 15 years is 0.5 g calculate the initial amount of sample.

Sr-90 has a half-life of 29 years. If the final sample after 15 years is 0.5 g calculate the initial amount of sample.

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Sr-90 has a half-life of 29 years. If the final sample after 15 years is 0.5 g calculate the initial amount of sample.
Transcribed Image Text:Sr-90 has a half-life of 29 years. If the final sample after 15 years is 0.5 g calculate the initial amount of sample.
Expert Solution
Concept and Principle:
  • Radioactive decay takes place when an unstable nucleus becomes stable. The instability arises due to a mismatch between the number of neutrons and protons. Only a few configurations of neutrons and protons are stable.

 

  • The radioactive decay will be exponential in nature and is given by,

N=N0e−0.693(tt12)

Here N0 is the original number of radioactive nuclei present, t is the time, and t1/2 is the half-life of the radioactive sample. This is known as the exponential law of radioactive decay.

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