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:
A.
Explanation:
high mountains and plateaus
Answer:
Andes Mountains
Explanation:
They run across Chile, Argentina, Bolivia, Peru, Ecuador, and Venezuela
Answer:
Humans produce too much carbon dioxide, and because of the chemical composition of water, more specifically, the water in the ocean, it is inclined to absorb it, thus making it acidic. Furthermore, human waste contributes to the acidity of the oceans.
Answer:
The answer to be filled in the given blank is
option B) low, high
Explanation:
Therefore, during the daytime, heating of land is faster as compared to water which causes <u>low</u> pressure to form over land and <u>high</u> pressure over coastal areas.
This is because the heat capacity of water is more as compared to land, i.e., water takes longer time to vary its temperature than land. Thus land gets heated faster as compared to water.
Therefore, movement of warm air above the land reduces pressure over land and increases pressure over sea.
