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kompoz [17]
3 years ago
15

A radioactive element has a half-life of 1,000 years. If a sample of this element begins with a mass of 20 grams, how long would

you have to wait for the mass to decrease to 5 grams?
A. 2,000 years
B. 500 years
C. 250 years
D. 1,000 years
Geography
1 answer:
Fynjy0 [20]3 years ago
7 0

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.

Learn more about radioactive decay brainly.com/question/9796067

#learnwithBrainly

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