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April 1, 2015

Posted by **julie** on Thursday, January 13, 2011 at 10:52am.

now, how much did you have 55 minutes ago?

- half life -
**DrBob222**, Thursday, January 13, 2011 at 3:17pmk = 0.0.693/t

_{1/2}

k = 0.693/31 = 0.0224 min^-1

ln(No/N) = kt

No = unknown

N = 77

k = from above.

t = 55 min

- half life -
**h**, Friday, January 14, 2011 at 7:04pmlook at the intro to nuclear physics (2500U) tutorial notes (tut 6 i think)

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