Answer:
the correct answer is letter C
Explanation:
The correct answer to this open question is the following.
Churchill’s quote that accurately describes the relationship between Hitler and Chamberlain is the following: "You were given the choice between war and dishonor. You chose dishonor and you will have war."
Neville Chamberlain had been the British Prime Minister at the beginning of the war. Winston Churchill seriously opposed Chamberlain's policy of appeasement that grated Nazi leader, Adolph Hitler, many concessions to avoid another war. Chamberlain had accepted to grant Hitler some territories to appease Hitler's ambition and Winston Churchill found this intolerable and in the end, he was right. Hitler's troops invaded Poland on September 1m 1939, and this represented the beginning of World War II.
Kosovo was the newest country that declared independence from Serbia.
East Asia's coastal, island and peninsula area are similar as they lie on the Ring of Fire. Accordingly, every one of these territories has tremors and volcanoes. Be that as it may, they additionally have hot springs. These ranges are unique in relation to inland regions due to the elevation: the island is more tough and rocky than the beach front, island and promontory zones.
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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