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zloy xaker [14]
3 years ago
12

Which of the following is not a phase change?

Chemistry
1 answer:
sweet [91]3 years ago
6 0
C. Diffusion is not a phase change.
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Answer:

27 and 32

Explanation:

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The half life for the decay of carbon-14 is 5.73 x 10 years. Suppose the activity due to the radioactive decay of the carbon-14
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Answer:

Age of the atifact is 4.2\times 10^{2} years

Explanation:

  • For first -order radioactive decay- A_{t}=A_{0}(\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}}
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Plug-in all the given values in the above equation-

19=20\times (\frac{1}{2})^{\frac{t}{5.73\times 10^{3}}}

or, t=4.2\times 10^{2}

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The removal of one or more electrons from a neutral atom results in a cation.

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