Asked by julie

If the radiological half life of a material is 31 minutes, and you have 77 grams
now, how much did you have 55 minutes ago?
Answered by DrBob222
k = 0.0.693/t<sub>1/2</sub>
k = 0.693/31 = 0.0224 min^-1

ln(No/N) = kt
No = unknown
N = 77
k = from above.
t = 55 min
Answered by h
look at the intro to nuclear physics (2500U) tutorial notes (tut 6 i think)
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