You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years.

How many grams are left after 1 half life?

• 100 grams

• 25 grams

• 2 grams

• 50 grams

Tags

NGSS.HS-PS1-8

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

The time it takes for a radioactivity level to drop by a half is is the sample's ___________________.

• quarter life

• whole life

• wonderful life

• half life

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

When an isotope goes through 3 half-lives, _____ _________________ remains

• 1/32 of 3.125%

• 1/8 or 12.5%

• 1/16 or 6.25%

When an isotope goes through 2 half-lives, _____ _________________ remains

• 1/4 or 25%

• 1/2 or 50%

• 1/8 or 12.5%

What is the half-life of radium-226?

• 1600 years

• 3200 years

• 4800 years

• 6400 years

What is the half-life of strontium-90?

• 25 days

• 50 days

• 75 days

• 100 days

In nuclear reactions--

• a large amount of matter produces a small amount of energy.

• a small amount of matter produces a large amount of energy.

When a large nucleus (like Uranium) is split, causing a chain reaction that releases explosive force (a)  

• Nuclear Fusion
• Nuclear Fission