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!!!
Answer:
In cities due to high population and presence of more services.
Explanation:
Most shopping malls are present on that location where human population is higher such as cities and towns because people are the customers who bought the products present in these malls. The owners of malls built malls in the cities due to the presence of high population of peoples in order to sale more products to the people and earn high profit. these malls also built in cities due to the presence of services such as electricity and water etc.
Climatologists warn of a tipping point when global temperatures trigger catastrophic events like the melting of the polar ice cap and this will result in sea levels rising more than 50 feet. The correct option among all the options that are given in the question is the last option. That would be the day of doom for most people living on planet earth.
<u>Answer:</u>
Fault rupturing by the earthquake is largely governed by the Elastic rebound theory. In geology, the elastic rebound theory is an explanation of how energy is released during an earthquake. It explains that as rocks on opposite side of the fault are subjected to some force and shift.
They gather energy and deform slowly unless their internal strength increases causing a sudden movement occurs along the fault. This results in the releasing of the accumulated energy and rocks move back to their original but unreformed shape.
