Radioactive rubidium-84 decays with a half-life of 37.1 days. (a) what is the value of k in s−1? 3.17e-7 incorrect: your answer is incorrect. s−1 (b) a sample contains 21.0 mg 84rb. how many decay events will be produced in the first second? assume that the atomic mass of 84rb is 84.0. decay events (c) a chemist obtains a fresh sample of 84rb and measures its radioactivity. she then determines that to do an experiment, the radioactivity cannot fall below 50.0% of the initial measured value. how long does she have to perform the experiment? days

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.