Half Life: Quiz Type Questions

If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

• 1.25mg
• 1.25g
• 10g
• 10mg

Tags

NGSS.HS-PS1-8

If the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?

• 1 half-life
• 2 half-lives
• 3 half-lives
• 4 half-lives

Tags

NGSS.HS-PS1-8

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?

• 100.0g
• 50.0g
• 12.5g
• 8.5g

Tags

CCSS.HSF.LE.A.4

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

• 3.0g
• 0.25mg
• 0.3g
• 0.25g

Tags

CCSS.HSF.LE.A.4

What is Half-life?

• The amount of time it takes for some of the nuclei in a sample of the isotope to decay
• The amount of time it takes for half the electrons in a sample of the isotope to decay
• The amount of time it takes for half the nuclei in a sample of the isotope to decay
• the amount of time it takes to double the nuclei in a sample of the isotope to decay

Tags

NGSS.HS-PS1-8

After the third half-life for all isotopes, what percent of a radioactive sample is left?

• 50%
• 33%
• 25%
• 12.5%

Tags

NGSS.HS-PS1-8

As a sample of Neon-19 undergoes radioactive decay, its half-life will

• decrease
• increase
• remain the same
• start over

Tags

NGSS.HS-PS1-8

If a radioactive isotope has a half life of 15 minutes,  how many half lives will this isotope undergo after 120 minutes?

• 8
• 15
• 30
• 2

Tags

NGSS.HS-PS1-8

If a radioactive isotope has a half life of 15 minutes,  how many half lives will this isotope undergo after 2 hours?

• 8
• 15
• 30
• 2

Tags

NGSS.HS-PS1-8

The half life of a radioactive isotope is 24 days.  What mass of a 25 grams sample will remain after 96 days?

• 4 g
• 1.56 g
• 12.5 g
• 25 g

Tags

NGSS.HS-PS1-8