Each year, a physicist measures the remaining radioactivity in a sample. She finds…
MATHEMATICS · Multi-part · A Level · Mathematics · Exponentials and logarithms · Exponentials and logarithms
Problem
Each year, a physicist measures the remaining radioactivity in a sample. She finds that it reduces by 18% each year. If there was 1.52 g of radioactive material left after 4 years:
(1) Find the initial quantity of radioactive material.
(2) How many *more* years will it take for the amount of radioactive material to reduce to 0.2 g?