A nucleus has a half life of 30 minutes At 3 PM its decay rate was measured as 120 000

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(#M40027257) KVPY question General Ability Test -2010 Keep an EYE

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: Asked In KVPY (11 years ago); Unsolved; Is this Puzzle helpful? (0) (0) Submit Your Solution

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Latest KVPY Aptitude Question SOLUTION: 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/s