If 9.0 g of a radioactive isotope has a ...

If 9.0 g of a radioactive isotope has a half life period of 10 hrs. The half life period of 3.0 g of the same substance is:

A

202.28 Sec

B

102.28 Sec

C

3.4 minutes

D

34 minutes

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The correct Answer is:

C

`((0.693)/(t_(1//2))) xx 5 = 2.303 log ((3.8)/(1.36)) , t_(1//2) = (0.693 xx 5)/(2.303 xx 0.446) = 3.374` min = 3.4 min

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