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Question

Th half-life of 198Au is 2.7 days. (a) Find the activity of a sample containing 1.00 μg of 198Au. (b) What will be the activity after 7 days ? Take the atomic weight of 198Au to be 198 g mol1


Solution

(a) We know that activity = λn

and Here n=1×106×6.23×1023198

=6.023×1017198

So, activity

=0.963×1017×6.0232.7×198×24×3600×13.7×1010Ci

=0.244Ci

(b) We know that

A=A8 eλr

=0.244×e0.6988×7

=0.244×e1.7966

=0.040Ci


Physics
Concepts of Physics
Standard XII

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