The radioisotpe, N-13,has a half-life o...

The radioisotpe, N-13,has a half-life of 10.0 minutes is used to image organs in the body. If an injected sample has an activity of 40 microcuries `(40,muCi)`, what is its activity after 25 minutes in the body?

`0.75 muCi`

`3.5 muCi`

`7.1 muCi`

`12 muCi`

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