Question
The count rate of a Geiger- Muller counter for the radiation of a radioactive material of half life of 30 minutes decreases to 5s−1 after 2 hours. The initial count rate was
Answer: Option B
:
B
A=A0(12)t/T1/2⇒5=A0(12)2×6030=A016⇒A0=80sec−1
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B
A=A0(12)t/T1/2⇒5=A0(12)2×6030=A016⇒A0=80sec−1
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