A sample of a radioactive element has a mass of 10 g at an instant t=0. The approximate mass of this element in the sample left after two mean lives is A1.35 g B2.50 g C3.70 g D6.30 gSubmit A sample of radioac
结果1 题目 The number of parent nuclei in a sample of a radioactive element is N at time r.The radioactive element has a half-life2The rate of decay is proportional to A A N Bt○C1/x D:3○ 相关知识点: 试题来源: 解析 A 反馈 收藏 ...
Determine the half-life (in s) of a radioactive sample that contains 1.60 times 10^15 atoms of the radioactive nuclide and has an activity of 6.40 times 10^11 Bq. How much time is required for a 6.25-mg sample of radioactive C to ...
View Solution A saample of radioactive elements contains4×1016active nuclei. If half-life of element is10days, then the number of decayed nuclei after30days is View Solution Doubtnut is No.1 Study App and Learning App with Instant Video Solutions for NCERT Class 6, Class 7, Class 8, Cla...
Answer to: Suppose a sample of a radioactive substance weighs 38 mg. One year later, the sample weighs 21.5 mg. What is the half-life of this...
THE Czechoslovak newspapers reported on July 5 that an element of higher atomic weight than uranium has been discovered in Joachimsthal pitchblende by Dr. O. Koblic. The element has been assigned the atomic number 93 and its atomic weight has been found to be 240 from an analysis of the ...
half-life of a radioactive element is defined as the time that it takes for one-half a quantity of the element to decay. Radioactive Carbon-14 is found in all living organisms and has a half-life of 5730 years. Archaeologists use this information to estimate the age of fossils. Consider...
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Uranium is a naturally occurring radioactive element, which has the atomic number of 92 and corresponds to the chemical symbol U in the periodic table. It belongs to a special group of elements called “actinides” — elements that were discovered relatively late in history. Like all other act...
The half-life of a radioactive substance is the interval in which a sample of the substance is reduced to half of its original mass. Let the initial mass of a sample of a radioactive substance be m0. Let the half-life of...