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January 24, 2015

January 24, 2015

Posted by **Jannet** on Monday, April 21, 2014 at 5:15pm.

- Radioactivity or science -
**DrBob222**, Monday, April 21, 2014 at 6:01pmk = 0.693/t

_{1/2}

Then

ln(No/N) = kt

No = 120 ug

N = solve for this

k = from above

t = 120 sec.

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