Suppose you start with 1 kilogram of a radioactive substance that has a half-life of 10 years.Which of the following statements will be true after 20 years pass?
A)You'll have 0.25 kilogram of the radioactive substance remaining.
B)All the material will have completely decayed.
C)You'll have 0.75 kilogram of the radioactive substance remaining.
D)You'll have 0.5 kilogram of the radioactive substance remaining.

Question

Quizplus · Accepted Answer

After 10 years, half of the substance will have decayed, leaving 0.5 kg. After another 10 years (totaling 20 years), half of that remaining 0.5 kg will have decayed, leaving 0.25 kg.

Suppose You Start with 1 Kilogram of a Radioactive Substance