1.

The count rate of a Geiger- Muller counter for the radiation of a radioactive material of half life of 30 minutes decreases to 5\[{{s}^{-1}}\]after 2 hours. The initial count rate was [CBSE PMT 1995]

A.            25\[{{s}^{-1}}\]                   
B.            80\[{{s}^{-1}}\]
C.            625\[{{s}^{-1}}\]                 
D.            20\[{{s}^{-1}}\]
Answer» C.            625\[{{s}^{-1}}\]                 


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