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Question

Two radioactive sources A and B initially contain equal number of radioactive. Source A has a half-life of 1hour and source B has a half-life of 2hours. the ratio of the rate of disintegration of A to that of B is:

A
1:2
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B
2:1
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C
1:1
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D
1:4
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Solution

The correct option is B 2:1
We know, t1/2=loge2K
Given, Half life of A (tA)=1hr =loge2KA

And, Half life of A (tB)=2hr =loge2KB
tAtB=KBKA

KAKB=21
Therefore, B is correct option.

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