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The activity of a sample of ""(16)^(36)S...

The activity of a sample of `""_(16)^(36)S` falls to 25% of its initial value after 174.2 days. The half life period of `""_(16)^(36)S` is

A

174.2 days

B

87.08 days

C

17.42 days

D

10 days

Text Solution

Verified by Experts

The correct Answer is:
B
`t=(2.303)/(lambda)"log"((a)/(a-x))`
`174.2 =(2.303)/(0.693)"log"(100)/(25)`
t=87.08 days.
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