Half Life Calculations Practice

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.

• 25mg

• 1.25g

• 10g

• 10mg

Tags

NGSS.HS-PS1-7

After the third half-life, how much of the sample is left?

• 1/2

• 1/3

• 1/16

• 1/8

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?

• half-life

• half-lives

• half-lives

• half-lives

Tags

NGSS.HS-PS1-8

Fermium-253 has a half-life of 0.334 seconds. A radioactive sample is considered to be completely decayed after 10 half-lives. How much time will elapse for this sample to be considered gone?

• 0.334 seconds

• 3.34 seconds

• 1.77 seconds

• 13.4 seconds

Tags

NGSS.HS-PS1-8

Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?

• 0.25g

• 2.5g

• 25g

• 80g

________________ is the time it takes for half of the radioactive atoms in an element to decay.

• Half-life

• Radiation

• Relative age

• Full-life

Tags

NGSS.HS-PS1-8

You find a rock sample with radioactive atoms present.  If 12.5% of the original radioactive atoms were present, how many half-lives has the rock been around for? (Hint, at Half-Life = 0, you start with 100%)

• zero

• 1

• 2

• 3

Tags

NGSS.HS-PS1-8

You find a rock sample with radioactive atoms present.  If 25% of the original radioactive atoms were present, how many half-lives has the rock been around for? (Hint, at Half-Life = 0, you start with 100%)

• zero

• 1

• 2

• 3

Tags

NGSS.HS-PS1-8

Using ESRT (A) [Radioactive Decay Data], what is the half-life in standard notation of carbon-14?

• 5,700 years

• 57,000 years

• 570,000 years

• 5,700,000 years

Tags

NGSS.HS-PS1-8

Using ESRT (A) [Radioactive Decay Data], what is the half-life in standard notation of Uranium-238?

• 4,500 years

• 450,000 years

• 4,500,000 years

• 4,500,000,000 years

Tags

NGSS.HS-PS1-8