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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Answer:
The sedimentary rock is a rock that has been made from other rocks that had existed in the Earth. The sedimentary rock has different layers of rock that can take form as gravel, stone, and maybe even a few gems inside.
Explanation:
The first step would be that the rock would be in liquid form, 2nd stage would be the sludge stage, which would contain both solids and liquids, then overtime, the sedimentary rock would form. The Sedimentary rock can also be made out of mud and sand that has been under countless pressure overtime. But you would be most able to find one near deserts, lakes, seas, and rivers. So bodies of water would give you the advantage to find this rock.
Answer:
Decrease R1400 in the ratio 7:3
Since this is a square you can set 3x+20=5x then you can solve for x.
Subtract 3x from both sides:
3x-3x+20=5x-3x
20=2x
Divide both sides by 2
20/2=2x/2
10=x
Hope this helps.
The Nile River is located in Africa
