The count rate for 10 
of radioactive material was measured at different times and this has been shown in the above graph with scale given. The half‐life of the material and the total count in the first half‐value period, respectively are.
Text Solution
Verified by ExpertsThe correct answer is:
B
Half‐value period 
hours
minutes 
minutes
Approximate mean disintegration rate
Total count in first half‐value period
Total number of disintegrations is slightly greater than 
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