A radioactive element with a half-life of 1,000 years, and starting mass of 20 grams, will need 2,000 years to decrease to 5 grams.
Explanation:
The radioactive elements all have a specific half-life. Each element's half-life is well known, and they are used by scientists of numerous fields as they are excellent for determining the age of a particular item, be it or organic or non-organic nature. In this case, we have a radioactive element with a half-life of 1,000 years, and starting mass of 20 grams.
The half-life basically means that half of the mass of an element is lost during a particular period of time. For the element in question we need to find out how much time will be needed for it to decrease to 5 grams. In order to get to the result, we just need to add 1,000 years on every decrease of half of the mass:
20/2 = 10
10/2 = 5
So in 1,000 years, the element in question will decrease to 10 grams, and in further 1,000 years (2,000 cumulatively) it will decrease to 5 grams.
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I would think that it is true bit in not sure
Answer:
10
Explanation:
this is the answer I think because I took the test
Rivers rise from higher slope and flow towards the lower due to the fact that there's more pressure the lower it goes.
<h3>What is a river?</h3>
It should be noted that a river simply means a large natural stream of water flowing in a channel into the sea.
In this case, rivers rise from higher slope and flow towards the lower due to the fact that there's more pressure the lower it goes.
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The correct answer is - To help schools across Georgia integrate peacefully.
The Sibley Commission in 1960 in Georgia, had the purpose to help the schools in the state to integrate peacefully and without any problems.
This commission put an ultimatum to the Georgia governor that either the schools will integrate and stop the segregation, or all the schools will be forbidden to work.
The officials of Georgia had to accept this as they could not afford all the schools to be closed. Finally, Georgia started integrating the children of all ethnic and racial groups in the schools, thus putting the racism aside.
