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Q.

A sample of a radioactive element that contains 1.0 x 103 nuclei decays to 6.2 x 101 nuclei in 10. Minutes, What is its specific decay constant?

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a

6.2 min-1

b

1.2 min-1

c

0.28 min-1

d

0.062 min-1

answer is C.

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Detailed Solution

621000=e−λt

2.78=λt

λ=2.78t=2.7810 min−1

 λ=0.28 min−1

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