... DỤC IDJĐỀ THI SỐ 2Họ và tên thí sinh: Số báo danh: ĐỀ THI THỬ ĐẠI HỌC 2011MÔN THI: TIẾNG ANH Thời gian làm bài: 90 phút (Đề có 11 trang, gồm 80 câu trắc nghiệm)Mã đề thi TA002Read ... IDJcarbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5, 570 years ... object.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 to nitrogen-14 in thatsubstance...