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jesus3426
26.08.2019 •
Mathematics
Assume the substance has a half-life of 11 years and the initial amount is 126 grams.how long will it be until only 15 % remains?
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Ответ:
(1/2) to the x/11 power = 0.15
Take the log of both sides :
(x/11) times log(1/2) = log(0.15)
Multiply both sides by 11 :
'x' times log(1/2) = 11 x log(0.15)
Divide both sides by " log(1/2) " :
x = 11 x log(0.15)/log(1/2) = 30.107 years (rounded)
That's the time it takes for any-size sample of this substance
to decay to 15% of its original size.
Ответ:
1.46 = 2.1316%
= 2%
Hope this helps :D
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