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`]

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 ]

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?

A certain radioactive material is known to decay at a rate proportional to the amount present. If initially there is 50 kg of the material present and after two hours it is observed that the material has lost 10% of its original mass, find () and expression for the mass of the material remaining at any time t, (ii) the mass of the material after four hours and (iii) the time at which the material has decayed to one half of its initial mass.

A certain radioactive material is known to decay at a rate proportional to the amount present. If initially there is 50 kg of the material present and after two hours it is observed that the material has lost 10% of its original mass, find () and expression for the mass of the material remaining at any time t, (ii) the mass of the material after four hours and (iii) the time at which the material has decayed to one half of its initial mass.

1 mg redium has 2.68xx10^18 atoms. Its half life is 1620 years. How many radium atoms will disintegrate from 1 mg of pure radium in 3240 years ?

Radium decomposes at a rate proportional to the quantity of radium present. It is found that in 25 years, approximately 1.1% of a certain quantity of radium has decomposed. Determine approximately how long it will take for one-half of the original amount of radium to decompose? [Given (log)_e 0.989=0. 01106a n d(log)_e2=0. 6931 ]

Radium Ra^236 has a half-life of 1590 years. How much of the original amount of Ra^236 would remain after 6360 year ?

The rate of growth of a population is proportional to the number present. if the population of a city doubled in the past 25 years, and the present population is 100000, when will the city have a population of 500000? [Given, log_e 5 = 1.609 , log_e 2 = 0.6931 . ]

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.