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!!!
C.TO DETERMINE the political ideologies of the individuals who live in a country
You could make like a building somewhere high so when everyone gets a warning that a flood is coming they can go and leave there let’s there or like a boat like Noah’s arc
Hope this helps —- xoxo
Answer:
There are many ways that classes of people differentiate themselves from others, but one of the most common ways is by race and/or community where there is a plurality of people. Those may be rather stereotypical pictures, but you get the idea. Diversity is awesome. One lifespan isn't enough to discover all the many forms human beings are and why.
Carbon-neutral status can be achieved in two ways:
Balancing carbon dioxide emissions with carbon removal beyond natural processes, often through carbon offsetting, or the process of removing or sequestering carbon dioxide from the atmosphere to make up for emissions elsewhere.
