For a substance the average life for α-emission is 1620 years and for β emission is 405 years. After how much time the 1/4 of the material remains after α and β emission
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a
1500 years
b
300 years
c
449 years
d
810 years
answer is C.
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Detailed Solution
per year and per year and it is given that the fraction of the remained activityTotal decay constantWe Know that= 324 x 2 x 0.693 = 449 years.