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Misha Larkins [42]
3 years ago
13

Which is not a layer found in the earth's mantle? A. Upper mantle B. asthenosphere C. lithosphere D.crust

Chemistry
1 answer:
Debora [2.8K]3 years ago
5 0

Answer:

LITHOSPHERE

Explanation:

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A topographical map would be useful for which activity? A. planning a hiking trip B. studying plant growth over time C. studying
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Half life is the time that it takes for half of the original value of some amount of a radioactive element to decay.

We have the following equation representing the half-life decay:

A=A_o\times2^{(-\frac{t}{t_{half}})_{}_{}}

A is the resulting amount after t time

Ao is the initial amount = 50 mg

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We replace the know values into the equation to have an exponential decay function for a 50mg sample

A=\text{ 50 }\times2^{\frac{-t}{14.3}}

That would be the answer for a)

To know the P-32 remaining after 84 days we have to replace this value in the equation:

\begin{gathered} A=\text{ 50 }\times2^{\frac{-84}{14.3}} \\ A=0.85\text{ mg} \end{gathered}

So, after 84 days the P-32 remaining will be 0.85 mg

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