If four half-lives have passed, how old is a sample that contains radioactive material with a half-life of 5,730 years? If the half-life of uranium-235 is 7.04 x 10^8 y and 12.5 g of uranium-235 remain after 2.8
The half-life period of a first order reaction is 100 sec. The rate constant of the reaction is View Solution Half life period ofC14is : - View Solution Exams IIT JEE NEET UP Board Bihar Board CBSE Free Textbook Solutions KC Sinha Solutions for Maths ...
<p>To find the half-life of a radioactive substance when 75% of it disintegrates in 30 minutes, we can follow these steps:</p><p><strong>Step 1: Understand the Disintegration</strong> If 75% of the substance has disintegrated, that means 25% of the origi
Half-Life: The half-life of a chemical species is the amount of time needed in order for the initial amount of the chemical species to be halved. This can take only seconds for some chemical species but years for others. Answer and Explanation: ...
已知氡的半衰期为4天,经过8天等于经过8/4=2个半衰期。每次半衰期剩余量减半,经过2次后剩余量为原量的(1/2)^2=1/4。选项分析:A. 1/2(仅经历1个半衰期的结果,错误。)B. 1/4(符合2个半衰期的计算,正确。)C. 1/8(需3个半衰期,不符合8天条件。)D. 1/16(需4个半衰期,超出时间范围。)故选B。
“There is a lot of really interesting evidence which seems to be suggesting that if children are inspired up to the age of seven, then being outdoors will be on habit for life.”“有很多有趣的证据表明，如果孩子在7岁之前受到启发，那么户外活动将成为终生的习惯。”His own children have got ...
英语(一)阅读逐句精读精讲 2012 Text 1 第一段 ①Come on—Everybody’s doing it. ②That whispered message, half invitation and half forcing, is what most of us think of when we hear the words peer pr…
40 What is meant by the half-life of a radioactive isotope? A half of the time taken for all of the original nuclei to decay B the time taken for half of the original nuclei to decay C the time taken for the charges on all the nuclei to halve D the time taken for the mass of...
Official answer: The half-life of a drug is the time it takes for the concentration of the drug in your blood plasma to decrease by...
What is the half-life of a substance that decays to 1/3 of its original radioactive amount in 5 years? Decay Constant and Half-life: The exponential expression that shows the relation between the decay constant {eq}\lambda {/eq} and the total time ...