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Alisiya [41]
3 years ago
12

The highest mountain peaks in the world are in the

Geography
2 answers:
AleksAgata [21]3 years ago
6 0
<span>B) Himalayas. i hope this heelp you
</span><span /><span>
</span>
kkurt [141]3 years ago
4 0
The answer is B!!!!!!!!!!
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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:

The age of the rock = 2800.6 million years = 2.8 billion years.

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.

Explanation:

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 = ?

k = decay constant

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

-kt = - 2.7726

t = (2.7726/0.00099) = 2800.6 million years

t = 2.8 billion years.

Hope this Helps!!!

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The greatest ring system around a planet in our Solar System surrounds which of the following planets?
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Saturn has the the largest ring system compared to Jupiter Neptune and Uranus
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Which three sentences describe the effect of Mongol invasions in Europe and Asia?
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The Mongols spread the use of gunpowder.The Mongols controlled both China and Russia.<span>Pax Mongolica encouraged trade along the Silk Road. I would honestly say these are the main effects of the Mongol incursion into Europe and Asia plus the inadvertent introduction of the bubonic plague of infected rats from Asia to Europe.</span>
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Small fragments of orbiting bodies that have fallen on earths surface are known as
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Small fragments of orbiting bodies that have fallen on earths surface are known as <em>Meteorite.</em>
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Helllllllpppppppp!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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