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Question

The count rate of a Geiger- Muller counter for the radiation of a radioactive material of half life of 30 minutes decreases to 5s1 after 2 hours. The initial count rate was

A
25 s1
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B
80 s1
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C
625 s1
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D
20 s1
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Solution

The correct option is B 80 s1
A=A0(12)t/T1/25=A0(12)2×6030=A016A0=80 sec1

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