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 radioactive element has a mass of 10g at an instant t=0. The approxima...
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...
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...
A radioactive element is a type of element whose nucleus is unstable. The atomic nuclei of radioactive elements are unstable because the number of protons and neutrons are not equal. As such, radioactive elements tend to decay. As they decay, they emit radioactive...
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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...
α-Particles. from the Radioactive Disintegration of a Light ElementWHEN lithium is bombarded with deuterons, a radioactive substance is formed which has been found to emit (-rays with energies up to 10.5 Mev.. We have recently found that this radioactivity is accompanied by the emission of ...