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:
Bangladesh
Nepal
Explanation:
There are eight countries that fall into the region of South Asia. Out of these eight countries, only two have centrally located capitals. Those two countries are Bangladesh and Nepal. Bangladesh's capital is Dhaka, and it is located in the central part of the country. It is the most populated city in the country, and it is also one of the places in the world with highest population densities. Kathmandu is the capital of Nepal. Nepal doesn't really have a shape so that a city can be far away from the borders, but if we look at it in a longitudinal manner, its capital comes to be in the central part of the country. It is by far the most populated city in the country, and it is the political, economic, cultural, administrative center.
Answer:
Near water, change in elevation, or change in latitude.
A location at a high altitude will experience the cool summers and mild winters compared to a location at a low altitude.
Explanation:
Near water bodies, change in elevation, or change in latitude are geographic position that can be considered a control of temperature. If a location is present at a high altitude, it will experience cool summers and mild winters compared to a location at a low altitude because of lower pressure at the top. Lower pressure at higher altitudes is the main cause of colder temperature on top of a mountain than at sea level..
