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Question

The half-life of a radioisotope is 10 h. Find the total number of disintegrations in the tenth hour measured from a time when the activity was 1 Ci.


Solution

Given t12=1602years

Ra=226 g/mole

Ci=35.5g/mole

1mole Ra Cl2=226+71=297g

297 g=1 mole of RaCl2=0.1×6.023×1028297

=0.02027×1022

λ=0.693t12

=0.6931602×365×24×3600

=1.371×1011

Activity=λN

=1.371×1011×2.07×1020

=2.779×109

=2.8×109disins. / sec


Physics
Concepts of Physics
Standard XII

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