Half Life Decay and Nuclear Decay

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

During radioactive decay ....?

• radioactivity is always given out

• radioactivity is sometimes given out

• radioactivity is never given out

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NGSS.HS-PS1-8

What is Half-life?

• The amount of time it takes for some of the nuclei in a sample to decay

• The amount of time it takes for all the nuclei in a sample to decay

• The amount of time it takes for half the nuclei in a sample to decay

• the amount of time it takes to double the nuclei in a sample

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NGSS.HS-PS1-8

Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?

• 0.25g
• 2.5g
• 25g
• 80g

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NGSS.HS-PS1-8

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

• 3.0g
• 0.25mg
• 0.3g
• 0.25g

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NGSS.HS-PS1-8

After 4 half-lives,there is now a 1g sample of Krypton-85. What was the original mass of the sample?

• 16g

• 32g

• 0.0625g

• 4g

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NGSS.HS-PS1-8