A radioactive sample is α-emitter with half life 138.6 days is observed by a student to have 2000 disintegration/sec. The number of radioactive nuclei for given activity are

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3.45 x 1010

1 x 1010

3.45 x 1015

2.75 x 1011

answer is A.

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Detailed Solution

Activity of substance that has 2000 disintegration/secThe number of radioactive nuclei having activity A

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