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:
They are both IGO's intergovernmental organizations
Explanation:
Answer:
I think it's false
Explanation:
I think 60-70% the body is made up of water and we can only live three to five days without water. Water plays many important roles in the body such as, regulating body temperature, transportation of nutrients and is necessary for digestion.
Answer:
Scalar quantity
Explanation:
Scalar quantities give a magnitude, while vector quantities give a magnitude and a direction. The answer will be a measurement that does not change, regardless of the direction of action. Displacement is a measure of length in a given direction; distance is the scalar version of displacement. hence length is scalar quantity
Answer:
They are different forms of government.
Explanation:
- A unitary system is a centralized form of system and we're all powers that are held by the same government and consist of a single agency like great Britain.
- In a federal system, the powers are divided between the center and the local government. like the U.S Canada, Switzerland and India.
- A confederation is an alliance of independent states or nations. Like the European Union.
