Calculating Half Life

The half-life of Iodine-131 is 8.10 days. How many days will it take a 50g sample to decay to 6.25g?

• 8.10 days

• 16.2 days

• 24.3 days

• 32.4 days

Tags

NGSS.HS-PS1-8

Carbon-14 has a half-life of 5,370 years. How many grams of a 144 g sample of Carbon-14 will remain after 17,190 years.

• 144 g

• 72 g

• 36 g

• 18 g

If the half-life of tritium is 12.26 years, what percentage would be left after 12.26 years?

• 100%

• 50%

• 25%

• It would all become daughter material

Tags

NGSS.HS-PS1-8

A 208 g sample of Sodium-24 decays to 13 g of Na-24 in 60 hours. How many hours is the half-life of Na-24?

• 4 hours

• 14 hours

• 15 hours

• 20 hours

Tags

NGSS.HS-PS1-8

The time required for half of the parent isotope to decay into daughter isotopes.

• Absolute Age

• Relative Age

• Fossil

• Half-life

Tags

NGSS.HS-PS1-8

The half - life of K - 42 is 12.4 hrs. How much of a 750 g sample is left after 62.0 hrs?

• 187.5 g

• 93.8 g

• 46.9 g

• 23.4 g

Tags

NGSS.HS-PS1-8

The half - life of radon - 222 is 3.8 days. How much of a 100 g sample is left after 15.2 days.

• 50.0 g

• 25.0 g

• 12.5 g

• 6.25 g

A 50.0 g sample of N - 16 decays to 12.5 g in 14.4 seconds. What is it's half - life?

• 14.4 sec

• 7.2 sec

• 3.6 sec

• 1.8 sec

The amount of time it takes for half of the particles of an element to decay is called:

• Absolute Age

• Half-Life

• Radioactivity

Tags

NGSS.HS-PS1-8

What is the half-life of a radioactive element?

• How old it is when it is middle aged

• The time it takes for half of the atoms to decay

• The time it takes for half of the atom to form

• How old it is when the Earth is middle aged

Tags

NGSS.HS-PS1-8