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.
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Answer:
Hardness is the mineral's ability to resist abrasion or scratching.
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Answer:
well 8 x 25 = 200 so thats the volume
Explanation:
Its when they turn time back. Early sunset, early sunrise.
Answer:
<u>14°C</u>
Explanation:
Place A = 2500 m = 20°C
Place B = 1500 m = ? °C
First of all, we know that <em>the air temperature decreases with 6°C at every 1000 m.</em>
So, now it is easy to find the temperature from place B.
If in place A, at 2500 m is 20°C, then at place B the temperature will be with 6°C lower.
Place B = 20°C - 6°C = <u>14°C</u>
