A) 4h, 9000
B) 3h, 14000
C) 3h, 235
D) 3h, 50
Correct Answer: B
Solution :
Read time for 50 count rate, it gives half-life period of 3 hrs, one small square gives 600 counts (10 × 60). The number of small squares between graph and time axis are approx 24 Hence count rate = \[24\times 600=14400\]You need to login to perform this action.
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