Question

A substance has a half-life of 100,000 years and an initial mass of 1,000 grams. How many years will pass before only 250 grams of the substance's parent material is left?

10,000

50,000

200,000

300,000

Answer 1

200,000 because after it undergoes one half life it reaches 500 grams it then undergoes another halflife to reach 250grams {halflife of a substance is defined as the time it takes for that substance to reach half its original size}

Answer 2

thanks :)

Answer 3

np