A radioactive substance has an initial mass of 800 g
MATHEMATICS · Multi-part · CBSE · Mathematics · Fractions in Disguise · Fractions in Disguise
Problem
A radioactive substance has an initial mass of 800 g. At the end of each day it retains 88 % of its mass from the previous day.
(i) Obtain an expression for the mass remaining after n days.
(ii) Compute the mass present after 15 days.
(iii) Find the least integer n for which the mass will be less than 100 g.
(iv) Calculate the total mass that decays during the first 15 days.