Half life quiz

What is Half-life?

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

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NGSS.HS-PS1-8

Pd-100 has a half-life of 3.6 days. If one had 620,310,740 atoms at the start, how many atoms would be present after 21.6 days?

• 9.7x10⁶ atoms remain
• 97.0x10⁶ atoms remain
• 0.97x10⁶ atoms remain
• 9.7x10⁵ atoms remain

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CCSS.HSF.LE.A.4

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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CCSS.HSF.LE.A.4

If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

• 1.25mg
• 1.25g
• 10g
• 10mg

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CCSS.HSF.LE.A.4

What is decay?

• a subatomic particle that has no charge located in the nucleus of an atom

• a stable atom that results from a radioactive atom

• a process in which a radioactive atom releases particles and energy

If one has 12 kg of Polonium and it undergoes two half-lives, how much do you have left?

• 12 kg

• 3 kg

• 6 kg

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NGSS.HS-PS1-8

After every half-life, a radioactive atom is

• reduced by 50%

• decreased by 1/4

• increased by 1/2

After 22,800 years, approximately what percentage of the original carbon-14 remains?

• 15%

• 12.5%

• 6.25%

• 3.125%

Tags

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

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

Tags

CCSS.HSF.LE.A.4