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Question

The half lives of radioactive elements X and Y are 3 minute and 27 minute respectively. If the activities of both are same, then the ratio of number of atoms of X and Y will be

A
1:9
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B
1:10
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C
1:1
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D
9:1
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Solution

The correct option is A 1:9
As, activitynumber of atoms×1halflifenumber of atomsactivity×halflife
So, the ratio of number of atoms of X and Y will be
3:27=1:9

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