Question

Element X is a radioactive isotope such that every 66 years, its mass decreases by half. Given that the initial mass of a sample of Element X is 240 grams, how much of the element would remain after 29 years, to the nearest whole number?

Answer 1

53grams... Approximated

Explanation:

In 66 years = 240/2 = 120 grams

In 1 year = 120/66 gram

In 29 years = 120/66 × 29 = 52.73grams

Answer 2

177 grams

Explanation: