Radioactive Isotope Half-Life Quiz

What is the primary concept of half-life as explained using a coin toss analogy?

• The time it takes for a coin to land tails up

• The time it takes for half of a radioactive sample to decay

• The time it takes for a coin to land heads up

• The time it takes for all isotopes to decay

How long is the half-life of Strontium-90?

• 86.4 years

• 57.6 years

• 28.8 years

• 14.4 years

What type of decay does the half-life of Strontium-90 represent?

• Quadratic decay

• Logarithmic decay

• Linear decay

• Exponential decay

In the half-life equation, what does 'a naught' represent?

• The half-life duration

• The remaining amount of isotope

• The original amount of isotope

• The time elapsed

If the half-life of an isotope is 28.8 years, how many half-lives have passed in 57.6 years?

• Three half-lives

• Four half-lives

• Two half-lives

• One half-life

What fraction of a radioactive isotope remains after two half-lives?

• 1/16

• 1/2

• 1/4

• 1/8

How many grams of Zinc-71 remain after 7.2 minutes if the original amount was 100 grams and the half-life is 2.4 minutes?

• 6.25 grams

• 25 grams

• 50 grams

• 12.5 grams

What is the half-life of Carbon-14 if 100 grams decays to 12.5 grams in 17,190 years?

• 8,595 years

• 11,460 years

• 5,730 years

• 17,190 years

How many atoms of Palladium-100 remain after 23 days if the original amount was 6.02 x 10^23 atoms and the half-life is 3.6 days?

• 7.2 x 10^21 atoms

• 1.8 x 10^21 atoms

• 3.6 x 10^21 atoms

• 9.0 x 10^21 atoms

What is the total time elapsed for Tritium to decay from 84 grams to 23.5 grams if its half-life is 12.3 years?

• 12.3 years

• 22.6 years

• 36.9 years

• 49.2 years