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Asked Sep 13, 2019
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A sample of a radioactive substance decayed to 92% of its original amount after a year. (Round your answers to two decimal places.)
(a) What is the half-life of the substance?
Xyr
(b) How long would it take the sample to decay to 5% of its original amount?
Xyr
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A sample of a radioactive substance decayed to 92% of its original amount after a year. (Round your answers to two decimal places.) (a) What is the half-life of the substance? Xyr (b) How long would it take the sample to decay to 5% of its original amount? Xyr

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Expert Answer

Step 1

Given,

A sample of a radioactive substancedecayed to 92% of its original amount after a year.

Step 2

a). Half-life of the ...

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A A,x 921x2 100 0.92 2 Applying natural log on both sides, we get In(0.92) In 27 2) Inxylogx -0.0833 In ( h h=0.6931 0.0833 h=8.32 years

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