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Suppose we have a mysterious particle with measure half -life of 15 months and we are...

Suppose we have a mysterious particle with measure half -life of 15 months and we are give a box of around 10^23 of these particles. After 20 years about how many of these particles do should we expect to still be in the box?

A) 10^23 of them

B) Just under half the original amount, so just under 0.5x10^23

C) 5.8x10^21 of them

D) 3.9x10^20 of them

E) 1.5x10^18 of them

F) 3.4x10^16 of them

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