Half Life Decay

Has the symbol

• Alpha

• Beta

• Gamma

• proton

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NGSS.HS-PS1-8

Has the symbol

• Alpha

• Beta

• Gamma

• neutron

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NGSS.HS-PS1-8

Which type of nuclear radiation is being emitted here?

• Alpha

• beta

• gamma 

• none

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NGSS.HS-PS1-8

Balance the following equation:
¹⁴₆C --> ⁰_-1e + ________

• ¹⁴₅B

• ¹⁴₆C

• ¹⁴₇N

• ⁴₂He

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NGSS.HS-PS1-8

What is the half-life of a radioactive isotope?

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

• The time it takes for all the radioactive atoms to decay

• The time it takes for one-quarter of the radioactive atoms to decay

• The time it takes for the radioactivity to double

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NGSS.HS-PS1-8

If a sample of a radioactive isotope has a half-life of 10 years, how much of the original sample will remain after 30 years?

• 12.5%

• 25%

• 50%

• 75%

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NGSS.HS-PS1-8

Which of the following is NOT a factor in determining the rate of radioactive decay?

• The half-life of the isotope

• The temperature of the environment

• The chemical form of the isotope

• The age of the isotope

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NGSS.HS-PS1-8

If a radioactive isotope has a half-life of 5 years, how many half-lives have passed after 20 years?

• 2

• 3

• 4

• 5

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NGSS.HS-PS1-8

How does the half-life of a radioactive isotope affect its usefulness in radiometric dating?

• Isotopes with longer half-lives provide more accurate dates for older samples.

• Isotopes with shorter half-lives are more dangerous and thus not used in radiometric dating.

• The half-life does not affect its usefulness in radiometric dating.

• Only isotopes with half-lives less than 1,000 years are useful for radiometric dating.

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NGSS.HS-PS1-8

What is the term for the time required for half of the radioactive atoms in a sample to decay to a stable end product?

• Decay period

• Radioactive period

• Half-life

• Transformation time

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NGSS.HS-PS1-8