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Sedaia [141]
2 years ago
12

"!HELP PLEASE!"

Geography
2 answers:
antiseptic1488 [7]2 years ago
4 0
My name is jeff and idk about the answer
Leona [35]2 years ago
3 0

Answer:

The Western Great lakes Subregion

Explanation:

The Easter United States is divided into 4 Subregions:

Southern: Florida, Mississippi, Alabama, Georgia, South Carolina.

Central: Kentucky, Tennessee, North Carolina, Virginia, West Virginia.

Northeastern: Pennsylvania, New York, New Jersey, Connecticut, Rhode Island, Massachusetts, New Hampshire, Vermont, Maine.

Western Great Lakes: Ohio, Indiana, Illinois, Wisconsin, Michigan.

The Atlantic Ocean borders the eastern United States in 3 Subregions; Southern (Florida, Georgia, South Carolina), Central (North Carolina and Virginia), and Mostly northeastern region from Maryland coast to Maine.

The Western great lakes do not border the ocean, but they border great lakes like Lake Michigan instead.

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Analysis of a rock sample that it contains 6.25% of its original uranium-235. How old is the rock? How do you know?
Andrews [41]

Answer:

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A simple method of analysis similar to Carbon dating is used to obtain the required age of the rock. Radioactive substances decay according to first order reaction kinetics. So, plugging all the required parameters into the general equation for amount of substance left in a first order decay gives us the age of the rock.

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Half life of Uranium-235 = 700 million years (from literature)

The decay of radioactive substances follow first order reaction kinetics.

The general equation is given as

A(t) = A₀ e⁻ᵏᵗ

A(t) = Amount of radioactive substance left after a particular time = 6.25%

A₀ = initial amount of radioactive substance = 100%

t = time that has passed since the beginning = age of the rock = ?

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The decay constant is related to the half life (T) through the relation,

k = (In 2)/T

k = (0.693/700) = 0.00099 /million years

A(t) = A₀ e⁻ᵏᵗ

6.25 = 100 e⁻ᵏᵗ

0.0625 = e⁻ᵏᵗ

In e⁻ᵏᵗ = In 0.0625 = -2.7726

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t = 2.8 billion years.

Hope this Helps!!!

7 0
3 years ago
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