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MCQ Solution: Atoms and Nuclei
 The initial activity of a sample is measured to be 3400 decays/seconds. After 145 seconds the decay rate is measured to be 150 decays/seconds. The half-life of the sample is approximately:

(1) 2 seconds.

(2) 6 seconds.

(3)  32 seconds..

(4) 27 seconds.

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