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Over [174]
3 years ago
7

Which reason best explains why metals are shiny?

Chemistry
1 answer:
ZanzabumX [31]3 years ago
5 0

Answer:

Best:

because their valence electrons absorb light

Minor:

because their valence electrons move to higher energy levels

Explanation:

When the electrons absorb light, they absorb this energy and they have a tedency to jump and get promoted to the high energy level.

As a result, they release out energy after being promoted. This energy is in form of light

.

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

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  • For first -order radioactive decay- A_{t}=A_{0}(\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}}
  • A_{t} represents activity of radioactive nuclide after t time, A_{0} represents initial activity of radioactive nuclide and t_{\frac{1}{2}} represents half-life
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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}}}

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So, age of the atifact is 4.2\times 10^{2} years

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