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A Nuclear Explosion Produces (Among a Lot of Other Things)7 ×\times

Question 74

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A nuclear explosion produces (among a lot of other things) 7.9 ×\times 1023 Bq of iodine-131,which has a half-life of 8.05 d,and 5.7 ×\times 1021 Bq of barium-140,which has a half-life of 12.8 d.The total activity that remains after 145 d is


A) 3.5 ×\times 1018 Bq
B) 1.16 ×\times 1020 Bq
C) 2.2 ×\times 1018 Bq
D) 5.2 ×\times 1018 Bq
E) 7.3 ×\times 1018 Bq

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