A radioactive substance disintegrates at as rate proportional to the amount of substance present. If 50% f the given amount disintegrates in 1600 years. What percentage of the substance disintegrates i 10 years ? `(-log2)/(160)T a k ee=0. 9957`

If is given that radium decomposes at a rate proportional to the amount present. If p % of th original amount of radium disappears in l years, what percentageof it will remain after 2l years?

Experiments show that radium disintegrates at a rate proportional to the amount of radium present at the moment. It's half life is 1590 years. What percentage will disappear in one year? [Use e^(-log2/1590)=0. 9996 ]

Experiments show that radius disintegrates at a rate proportional to the amount of radium present at the moment. Its half life is 1590 years. What percentage will disappear in one year? [Use e^(-log2/1590)=0. 9996 ]

A radioactive substance decays at an annual rate of 13 percent. If the initial amount of the substance is 325 grams, which of the following functions f models the remaining amount of the substance, in grams, t years later?

If 10% of a radioactive substance decays in every 5 year, then the percentage of the substance that will have decaed in 20 years will be .

If 10% of a radioactive substance decays in every 5 year, then the percentage of the substance that will have decaed in 20 years will be .

The rate at which radioactive substances decay is known to be proportional to the number of such nuclei that are present in a given sample. In a certain sample 10% of the original number of radioactive nuclei have undergone disintegration in a period of 100 years. Find what percentage of the original radioactive nuclei will remain after 1000 years.

1g of a radioactive substance disintegrates at the rate of 3.7xx10^(10) disintegrations per second. The atomic massof the substance is 226. Calculate its mean life.

20% of a radioactive substances decay in 10 days . Calculate the amount of the original material left after 30 days.

Half-life of a radioactive substance is 20 minutes. Difference between points of time when it is 33 % disintegrated and 67 % disintegrated is approximate.