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A nucleus has a half-life of 30 minutes. At 3 PM its decay rate was measured as 120,000 counts/sec

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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) 120,000 counts/sec 

(B) 60,000 counts/sec 

(C) 30,000 counts/sec 

(D) 7,500 counts/sec  

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1 Answer

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Correct Option :- (D) 7,500 counts/sec

Explanation :-

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