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Question

A count rate meter shows a count of 240 per minute from a given radioactive source. One hour later the meter shows a count rate of 3.0 per minute. The half life of the source is


A

120 min

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B

80 min

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C

30 min

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D

20 min

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Solution

The correct option is D

20 min


AAo=12n30240=12n2n=8n=3As n=3 i.e,tT=3 1T=3T=13 hr=20 minutes


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