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

question 74

Multiple Choice

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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