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jeka57 [31]
4 years ago
7

Suppose an egyptian mummy is discovered in which the amount of​ carbon-14 present is only about oneone​-fifthfifth the amount fo

und in living human beings. the amount of​ carbon-14 present in animal bones after t years is given by yequals=y 0 e superscript negative 0.0001216 ty0e−0.0001216t​, where y 0y0 is the amount of​ carbon-14 present in living human beings. about how long ago did the egyptian​ die?
Chemistry
1 answer:
poizon [28]4 years ago
3 0

We are given the following equation:

y = y0 e^-0.0001216 t

where y = 1/5 y0, y0 is the original amount

So solving for time t:

1/5 y0= y0 e^-0.0001216 t

t = 13,235.51 years

 

So the human died about 13235.5 years ago

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A large deposit of bauxite a mineral containing aluminium was found in your community. The deposit crosses a nature preserve. A
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Explanation:

One positive impact of the mining is that the sale of the Bauxite will increase their economic power by bringing in foreign exchange into their economy. This will improve services such as healthcare and infrastructure.

A negative impact is the destruction of the nature preserve and disturbing the ecosystem could lead to a devastating loss in biodiversity. A decrease in biodiversity will increase crop pests and diseases that destroy standing crops, and an increase in the prevalence of diseases in the community.

6 0
3 years ago
Which compound is covalently bonded? <br> Select one: <br> a. Al2O3 b. Fe2O3 c. SO2 d. CuCl2
azamat

Answer:

The answer is D-CuCl2

I hope this helps

7 0
3 years ago
Read 2 more answers
One significant difference between gases and liquids is that:
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Answer:

A

Explanation:

all the other answers are wrong or not applicable. hope this helps :)

7 0
3 years ago
An atom in its ground state is excited when it absorbs a single photon of light. The atom then relaxes back to the ground state
aivan3 [116]

Answer: Option (a)  is the correct answer.

Explanation:

The given data is as follows.

         wavelength of red photon (\lambda_{1}) = 700 nm

         wavelength of infrared photon (\lambda_{2}) = 1750 nm

Therefore, calculate the wavelength of absorbed photon as follows.

    \frac{1}{\lambda_{abs}} = \frac{1}{\lambda_{1}} + \frac{1}{\lambda_{2}}

              = \frac{1}{700} + \frac{1}{1750}

              = \frac{2450}{1225000}

or,            \lambda_{abs} = \frac{1225000}{2450}              

                            = 500 nm

Therefore, we can conclude that the wavelength of the absorbed photon is 500 nm.

4 0
3 years ago
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How many moles of water, H2O, contain 2.0×1022 molecules of water? (See the hints for assistance in interpreting scientific nota
hammer [34]
You have to use Avogadro's number which is 6.02x10^23.  The units of Avogadro's number is molecules/mole so you divide the number of molecules by Avogadro's number which will give you the number of moles.
(2.0x10^22 molecules)/(6.02x10^23 molecules/mole)=0.033 moles
5 0
4 years ago
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