The count rate of a Geiger Muller counter for the radiation of a radioactive material of half‐life of 30 minutes decreases to 
after 2 hours. The initial count rate was
A
80 
B
625 
C
20 
D
25 
Text Solution
Verified by ExpertsThe correct answer is:
A
Half‐life time 
minutes; Rate of decrease 
per second and total time 
hours 
minutes. Relation for initial and final count rate
Therefore 
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