Fission and Fusion + Half-Life

There are 2 distinct types of nuclear reactions: fusion and fission reactions. In which reaction is the nucleus of an atom split into 2 or more atoms?

• Fusion reactions

• Fission reactions

• Both nuclear reactions

• Neither nuclear reaction

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NGSS.HS-PS1-8

In order for fission reactions to be successful, they must be self-perpetuating, meaning they must be able to keep themselves going. What do you call the minimum amount of material that is needed for the reaction to keep going?

• isotope

• mass defect

• critical mass

• neutron

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NGSS.HS-PS1-8

Our sun is a star that is fueled by a specific type of nuclear reaction. Which type of nuclear reaction is this?

• Fusion

• Solar

• Fission

• Radioactive

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NGSS.HS-PS1-8

NGSS.HS-ESS1-1

Why is the fusion reaction not currently used to produce energy, especially as it is a "clean" form of energy that does not create radioactive or nuclear byproducts?

• There are currently not enough fuels for fusion reactions

• Fusion reactions are highly endothermic, making them dangerous

• Fusion reactioons do not yet produce enough energy

• The heat it takes to start a fusion reaction is too high to contain.

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NGSS.HS-ETS1-3

Fission reactions are currently used to provide energy for many different sources. Where does the energy produced during the reaction come from?

• From the mass lost during the reaction, or mass defect

• From the mass created during the reaction, or the mass increase

• From the critical mass of the reaction

• From the protons created during the reaction

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NGSS.HS-PS1-8

The time required for one half of a sample of a radioisotope to decay is called:

• half-time
• half-life

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NGSS.HS-PS1-8

After the third half-life, how much of the sample is left?

• 1/2
• 1/3
• 1/16
• 1/8

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NGSS.HS-PS1-8

Imagine you have 50,000 atoms of uranium-238. If U-238 has a half-life of 4.5 billion years, how many U-238 atoms will be left after 4.5 billion years? 

• 25,000
• 50,000
• 12,500
• 0

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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

Unstable nuclei breaks down releasing energy &/or particles

• Nuclear Fission
• Nuclear Fusion
• Radioactive Decay

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NGSS.HS-PS1-8