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julsineya [31]
4 years ago
5

How do I find the answer for 1/2 of 3/5

Mathematics
1 answer:
Tems11 [23]4 years ago
7 0
The answer is 0.3. To find this answer, <span>1/2 / 3/5 = <span>56</span> ≅ 0.8333333</span>
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Thorium -228 is a radioactive substance that decays 50% every 1.9 years. How much of a 50 gram sample will exist after 22.8 year
Evgesh-ka [11]

Answer:

A=0.0122\ gr

Step-by-step explanation:

The exponential decrease formula that we must use is:

A=A_0e^ {-kt}

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So

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25=50e^ {-k(1.9)}

We solve the equation for k

0.5=e^ {-k(1.9)}

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k=-\frac{ln(0.5)}{1.9}\\\\k=0.3648

After 22.8 years the amount of thorium that exists is:

A=50e^ {-0.3648(22.8)}

A=0.0122\ gr

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4 years ago
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VashaNatasha [74]
Always
Hope this helps :)
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