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The half-life of a radioactive element is 10 hours. How much will be left after 4 hours in 1 g atom sample? (A) 45.6 ×1023 atoms (B) 4.56 ×1023 atoms (C) 4.56 ×1021 atoms (D) 4.56 ×1020 atoms

The half-life of a radioactive element is 10 hours. How much will be left after 4 hours in 1 g atom sample?
(A) 45.6 ×1023 atoms (B) 4.56 ×1023 atoms (C) 4.56 ×1021 atoms (D) 4.56 ×1020 atoms

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2 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
3 years ago
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Vikas TU
14149 Points
3 years ago
So, if a problem asks you to calculate an element's half-life, it must provide information about the initial mass, the quantity left after radioactive decay, and the time it took that sample to reach its post-decay value. Therefore, its half-life is t1/2=98.012.7=7.72 years .

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