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Q.

The rate of radioactive disintegration at an instant for a radioactive sample of half life 2.2×109 s is 1010 s-1The number of radioactive atoms in that sample at that instant is,

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a

3.17×1019

b

3.17×1020

c

3.17×1017

d

3.17×1018

answer is A.

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Detailed Solution

T1/2=ln2λ=0.693λ 2.2×109=0.693λ λ=0.6932.2×109=3.15×10-10 R=λN           (R is activity)  N=Rλ=10103.15×10-10=3.17×1019
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