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Tugasimk
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Question 1-5

Carbon dating can be used to estimate the age of any organic natural material, it has been used succesfully in archeology to determine the age of ancient artifact or fossil as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on earth. Since a radioactive substance such as carbon 14 has a known half life the amount of carbon 14 remaining in an object can be used to date that object.
Carbon 14 hast a half life of 5,570 Read moreyears which means that after that number of year half of the carbon 14 atoms have decayed into netrogen 14 it is the ratio of carbon 14 to nitrogen 14 in that substance that indicates the age of substence. If for example in a particular sample the amount of carbon 14 is roughly equivalent to the amount of nitrogen 14 this indicates that roughly half of the carbon 14 has decayed into nitrogen 14 and the sample is approximately 5,570 year old.
Carbon dating cannot be used affectively in dating objects that are older than 80.000 years. When objects are old, much of the carbon 14 has already decayed into nitrogent 14 and the minuscule amount that is left does not provide a reliable measurement of age. In the case of older objects other age dating methods are available, methods which use radioactive atoms with longer half lives carbon has.

• 1.

• A.

The defferences between carbon -14 and nitrogen.

• B.

One method of dating old objects

• C.

Archeology and the study of ancient artifacts

• D.

Various use for carbon.

B. One method of dating old objects
Explanation
This page is mainly about one method of dating old objects. It discusses the differences between carbon-14 and nitrogen, which are used in this dating method. It also mentions archeology and the study of ancient artifacts, which are closely related to the dating of old objects. Additionally, it briefly mentions the various uses for carbon, which may be relevant to the dating process.

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• 2.

### The word “estimate” in line 1 closest in meaning to

• A.

Understand

• B.

Hide

• C.

Rate

• D.

Approximate

D. Approximate
Explanation
The word "estimate" in line 1 is closest in meaning to "approximate." This is because an estimate is an approximate calculation or judgment of the value, amount, or extent of something. It is not an exact or precise measurement, but rather a rough approximation. Therefore, "approximate" is the most suitable synonym for "estimate" in this context.

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• 3.

### The pronoun “it” in line I refers to

• A.

Carbon dating

• B.

The age

• C.

Any organic natural material

• D.

Archeology

A. Carbon dating
Explanation
The pronoun "it" in line I refers to carbon dating. Carbon dating is a method used in archeology to determine the age of organic natural materials.

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• 4.

### Which of the following is  not trus about carbon 14

• A.

• B.

Itâ€™s half-life is more than 5000 years

• C.

It and nitrogen always exist in equal amounts in any substance

• D.

It can decay into nitrogent 14

C. It and nitrogen always exist in equal amounts in any substance
Explanation
Carbon 14 and nitrogen do not always exist in equal amounts in any substance. Carbon 14 is a radioactive isotope of carbon with a half-life of about 5730 years. It can decay into nitrogen 14 through the process of beta decay. This means that over time, the amount of carbon 14 in a substance will decrease while the amount of nitrogen 14 will increase. Therefore, the statement that carbon 14 and nitrogen always exist in equal amounts in any substance is not true.

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• 5.

### The expression “is left” in paragraph 3

• A.

Remains

• B.

Has disappeared

• C.

Changes

• D.

Is gone

A. Remains
Explanation
The expression "is left" in paragraph 3 indicates that something still exists or continues to be present. It suggests that despite other changes or actions taking place, this particular thing remains unaffected or unchanged.

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• Mar 21, 2023
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• Dec 28, 2011
Quiz Created by
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