Is radioactive decay 'spontaneous' ?

• yes

• no

• sometimes

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NGSS.HS-PS1-8

Is radioactive decay 'random' ?

• yes

• no

• sometimes

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NGSS.HS-PS1-8

Which best describes what happens during radioactive decay?

• the emission of radioactivity

• the build up of radioactivity

• the splitting of radioactivity

• the expansion of radioactivity

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NGSS.HS-PS1-8

During radioactive decay, the element can change?

• true

• false

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NGSS.HS-PS1-8

During radioactive decay ....?

• another element might be made

• another element is always made

• another element is never made

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NGSS.HS-PS1-8

What percent of carbon-14 would be left after 5730 years?

• 100%
• 75%
• 50%
• 25%

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NGSS.HS-PS1-8

What is the half-life of iodine-131?

• 32 days
• 8 days
• 16 days
• 24 days

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NGSS.HS-PS1-8

¹⁴₆C has a half life of 5730 years, how many years would it take the 4.0 g sample to decay to 0.25 g?

• 4 years
• 5730 years
• 22,920 years
• 28,650 years

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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

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NGSS.HS-PS1-8

What type of decay is being illustrated in following picture? 

• beta decay
• alpha decay 

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NGSS.HS-PS1-8