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Câu hỏi:
It can be inferred from the passage that if an item contains more carbon-14 than nitrogen- 14, then the item is _____________.
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A.
not as much as 5,570 years old
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B.
too old to be age-dated with carbon-14
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C.
too radioactive to be used by archeologists
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D.
more than 5.570 years old
Lời giải tham khảo:
Đáp án đúng: A
Đáp án A.
Có thể suy ra từ đoạn văn rằng nếu một vật có chứa nhiều các-bon 14 hơn ni-tơ 14, thì vật đó là ................
A. không đến 5.570 năm tuổi
B. quá lâu đời để có thế xác định được niên đại với carbon-14
C. chứa quá nhiều phóng xạ để được sử dụng bởi các nhà khảo cổ.
D. trên 5.570 năm tuổi.
Dựa vào đoạn 2: “Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-lá, this indicates that around half of the carbon- 14 has decayed into nitrogen-14, and the sample is approximately 5.570 years old”: Carbon-14 có thời gian bán hủy là 5,570 năm, có nghĩa là sau từng ấy năm, một nửa các nguyên tử carbon-14 đã bị phân hủy thành nitơ-14. Chính tỷ lệ carbon-14 có trong chất đó cho thấy độ tuổi của nó. Thí dụ như, nếu trong một mẫu vật cụ thể lượng cacbon-14 tương đương với lượng nitơ- 14, điều đó chỉ ra rằng khoảng một nửa lượng carbon- 14 đã phân hủy thành nitơ-14, và mẫu vật đó có niên đại khoảng 5,570 tuổi.
Nếu một vật có chứa nhiều các-bon 14 hơn ni-tơ 14, thì chứng tỏ nó chưa hoàn tất chu kì bán hủy của mình kéo dài trong 5.570 năm nên vật đó chưa tới 5.570 tuổi.
Hãy trả lời câu hỏi trước khi xem đáp án và lời giải -
A.
Câu hỏi này thuộc đề thi trắc nghiệm dưới đây, bấm vào Bắt đầu thi để làm toàn bài
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