The count rate for `10 g` 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.A. 4 hours and 9000 (approximately)B. 3 hours and 14100 (approximately)C. 3 hours and 235 (approximately)D. 10 hours and 150 (approximately)

The count rate for `10 g` of radioactive material was measured at diff

1.	The count rate for `10 g` 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.A. 4 hours and 9000 (approximately)B. 3 hours and 14100 (approximately)C. 3 hours and 235 (approximately)D. 10 hours and 150 (approximately)
Answer» Correct Answer - B (b) Half-value period `= 3 hours` `= 3 xx 60 minutes = 180 minutes` Approximate mean disintegration rate =`(100 + 50)/(2) = 75` Total count in first half-valur period =`75 xx 180 ~~ 13500` Total number of disintegrations is slightly greater than `13500`.

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