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A nucleus has a half-life of 30 minutes....

A nucleus has a half-life of 30 minutes. At 3 PM its decay rate was measured as 120,000 counts/sec. What will be the decay rate at 5 PM ?

A

120,000counts/sec

B

60,000counts/sec

C

30,000counts/sec

D

7500counts/sec

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The correct Answer is:
D
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