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Câu hỏi:
Which of the following is NOT true about carbon-14?
- A. It and nitrogen always exist in equal amounts in any substance.
- B. Its half-life is more than 5,000 years.
- C. It can decay into nitrogen-14.
- D. It is radioactive.
Lời giải tham khảo:
Đáp án đúng: A
Đáp án A.
Câu nào dưới đây KHÔNG ĐÚNG về carbon-14?
A. Nó và nitơ luôn tồn tại với số lượng bằng nhau trong bất kỳ chất nào.
B. Thời gian bán hủy của nó là hơn 5.000 năm.
C. Nó có thể phân rã thành nitơ-14.
D. Nó là chất phóng xạ.
Các đáp án B, C, D có thông tin được tìm thấy trong bài.
B + C: - Dẫn chứng ở câu đầu 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”: Carbon-14 có thời gian bán hủy là 5.570 năm, có nghĩa là sau từng ẩy năm, một nửa các nguyên từ carbon-14 đã bị phân hủy thành nitơ-14.
D- Dẫn chứng ở câu cuối đoạn 1 : “Since a radioactive substance such as carbon-14 has a known half-life, [...]”: Bởi vì một chất phóng xạ thí dụ như carbon-14 có thời gian bán hủy như đã biết, [...]) →Carbon-14 là một chất phóng xạ.
Còn lại đáp án A không đúng.
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