Yr 11 - Half Life

What is the half-life of Carbon-14?

• 5730 years

• 11460 years

• 22920 years

• 34380 years

How many protons and neutrons does Carbon-12 have?

• 6 protons, 6 neutrons

• 6 protons, 7 neutrons

• 6 protons, 8 neutrons

• 7 protons, 6 neutrons

After how many half-lives will 25% of the original Carbon-14 remain?

• 1

• 2

• 3

• 4

What percentage of Carbon-14 remains after 3 half-lives?

• 50%

• 25%

• 12.5%

• 6.25%

Which isotope of carbon has 6 protons and 7 neutrons?

• Carbon-12

• Carbon-13

• Carbon-14

• Carbon-15

What is the time elapsed after 5 half-lives of Carbon-14?

• 5730 years

• 11460 years

• 17190 years

• 28650 years

What is the remaining mass of a substance after 2 half-lives if the initial mass was 8 grams?

(a)  

What does the prefix 'k' represent in SI multipliers?

• 1 x 10^3

• 1 x 10^-3

• 1 x 10^6

• 1 x 10^-6

What is the random nature of radioactive decay used to model?

• The decay of a collection of atoms using a constant probability of decay

• The growth of a collection of atoms using a variable probability of growth

• The stability of a collection of atoms over time

• The increase in energy of a collection of atoms

How can the half-life of a radioactive material be determined?

• By measuring the increase in temperature over time

• By plotting or sketching decay curves and analyzing the decay curve

• By observing the color change of the material

• By measuring the mass of the material over time