Exponential Funcation
2012-09-23 5:52 am
The weight of piece of radiocative substance after t years is 10e -1/30 g.After how many years will its weight be halved?
回答 (1)
2012-09-23 7:16 am
✔ 最佳答案
It shold be 10exp(-t/30) instead of 10exp(-1/30)As t = 0, the weight of this radiocative substance is 10g.
So, 10exp(-t/30) = 5
exp(-t/30) = 0.5
t = 20.7944
After, 20.7944 years, the weight of the radiocative substance will decrease 50%
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