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CBSE Class 12-science Answered

half life
Asked by | 21 Feb, 2010, 07:57: PM
answered-by-expert Expert Answer

It is given that disintegration rate to be proportional to the number of radioactive atoms in the sample.

So, [A]o = 4280 counts per min

[A] = 1070 counts per min

time is from 1:35 min to 4:55 min

So, 200 minutes

k = (2.303/t) log ( [A]o/ [A] )

k = (2.303/200) log(4280/1070)

 = 0.127

t1/2 = 0.693/k = 0.693/ 0.127 = 5.45 min

Answered by | 24 Feb, 2010, 04:22: PM
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