Uranium has a half life of 7x10^8 years appoximately. We know that its rate of desintegration is proportionnal to the actual quantity.During a nuclear accident,100 grams were released in the air
(a) write the differential equation adapted to this situation
(b) Write the equation that gives the remaining quantity of this substance at the time t
(c) what is the remaining quantity after 20 000 000 years?