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InterviewSolution
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A radioactive element has half life of `4.5 xx 10^(9)` years. If `80 g` of this was taken, the time taken for it to decay to `40 g` will be a. `2.25 xx 10^(9)` years b. `4.50 xx 10^(9)` years c. `6.75 xx 10^(9)` years d. `8.75 xx 10^(9)` yearsA. a. `2.25 xx 10^(9)` yearsB. b. `4.50 xx 10^(9)` yearsC. c. `6.75 xx 10^(9)` yearsD. d. `8.75 xx 10^(9)` years |
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Answer» Correct Answer - b. `4.50 xx 10^(9)` years `t_(1//2) = 4.5 xx 10^(9)` years Here the amount decay to 50% i.e., from `80 g` to `40 g` Therefore time required will be `4.5 xx 10^(9)` years. |
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