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Answer:
B and C
Explanation:
B. In a given rock sample, the amount of Silicon-32 isotopes gets divided in half about every 170yrs.
This is the concept of half-life. Half life is the time take for half of a radioactive isotope to disintegrate. The shorter the half life the faster the isotope disintegrates.
From the question, we were told that it would take 170yrs for half of the isotope of Silicon to disintegrate to Phosphorus. This is the half life.
C. The half life can be used to determine the amount of Si-32 that has decayed from the time closure temperature was reached.
The closure temperature is very important in radioactivity. It is the temperature at which a system has cooled and there is no resulting disintegration of parent and daughter isotopes.
From first order kinetics, we know that the rate at which radioactive elements decay at any time is directly proportional to the number of radioactive atoms present. A knowledge of the half life helps to figure out the number of atoms that has decayed in time.
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<u>Answer: Shiite Muslims</u>
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Answer:
A nation-state is a state where the vast majority of the population is comprised of a single ethnic group which also serves as a motivation and reason for the formation of the state.
Explanation:
A nation-state is a term used for the nations where the vast majority of the population is comprised of a single ethnic group, usually over 90%. There are multiple examples of such states around the world, some of which are fully recognized, while some function in practice as such but are not officially recognized by the United Nations. In the first category, we have the likes of Mongolia, Iceland, and numerous island nations in the Pacific, while in the second one we have the likes of Kosovo and South Ossetia.
These nations are often formed on the basis of the distribution of an ethnic group, thus determining the boundary in accordance with where the particular ethnic group is found without interruptions. An interesting case was the recent referendum for independence in Scotland as if it was successful it would have meant the creation of another nation-state. This was carefully monitored by many ethnic groups in the world because they saw it as an opportunity to create their own nation-states.
