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Radioactive ""^(131)I has a half-life of...

Radioactive `""^(131)I` has a half-life of 8.0 days. A sample containing `""^(131)I` has activity `20mu Ci` at t = 0.
(a) What is its activity at t = 4.0 days? (b) What is its decay constant at t = 4.0 days?

Text Solution

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The correct Answer is:
`14 muCi ` (b) `1.4 xx10^(-6)S^(-1)`
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