Half Life and Radioactivity

What is the Half life of this isotope?

• 5 seconds

• 10 seconds

• 15 seconds

• 20 seconds

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NGSS.HS-PS1-8

What is the Half Life of this isotope?

• 3 days

• 5 days

• 8 days

• 10 days

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NGSS.HS-PS1-8

The Half Life of Californium 252 is 5 years.

• TRUE

• FALSE

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NGSS.HS-PS1-8

The % of the parent isotope remaining after 2 Half Lives.

• 50%

• 25%

• 12.5%

• 6.25%

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NGSS.HS-PS1-8

After one half life, a sample will begin to have more of the parent isotope than the daughter isotope.

• TRUE

• FALSE

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NGSS.HS-PS1-8

The rate at which a radioactive element decays is its ____.

• quarter life

• whole life

• wonderful life 

• half life

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NGSS.HS-PS1-8

If the half life of a radioactive element is 100yrs, how long would it take for the radioactivity to reduce by one half?

• 200yrs

• 100yrs

• 50yrs

• 300yrs

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NGSS.HS-PS1-8

A certain radioactive sample has a half life of 2 years. After 6 years, how much of the sample is left?

• 1/2

• 1/3

• 1/16

• 1/8

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NGSS.HS-PS1-8

A sample of Radium-228 decays from 100g to 12.5g. How many half lives did it experience?

• 1

• 2

• 3

• 4

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NGSS.HS-PS1-8

Iodine-131 has a half life of 8.07 days. What fraction of a sample of Iodine-131 is left unchanged after 16.14 days?

• 1/2

• 1/4

• 1/8

• 1/16

Tags

NGSS.HS-PS1-8