Fission and Fusion

What is nuclear fusion?

• When a uranium nucleus absorbs a neutron.

• The coming together of small nuclei to form larger nuclei.

• The emission of neutrons from an atomic nucleus.

• The breaking apart of larger nuclei into smaller nuclei.

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Where does this process normally occur?

• Inside the Earth.

• Inside a nuclear reactor.

• Inside the Sun.

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Which is NOT a feature of this reaction?

• There is a net release of energy from this reaction.

• A lot of energy is released.

• A lot of energy is required to start the reaction.

• There is a net loss of energy from this reaction.

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Which of these is NOT an isotope of hydrogen?

• Deuterium

• Tritium

• Helium

• Hydrogen

What are two functions of the 'control rods' in a nuclear reactor?

• To control the rate of the chain reaction.

• To slow down the neutrons so that they are absorbed by uranium nuclei.

• To conduct the heat generated to the water to make steam.

• To stop the reaction in the case of an emergency.

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What is the correct order of events in terms of how energy is transformed in a nuclear reactor?

• nuclear to kinetic to kinetic to heat to electrical

• nuclear to kinetic to heat to kinetic to electrical

• nuclear to heat to kinetic to kinetic to electrical

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What is the name of the particle absorbed by a uranium nucleus in nuclear fission?

(Answer one word, lower case, make sure spelling is correct)

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Which would best describe the initial reaction occurring in a nuclear bomb?

• fission, induced

• fusion, induced

• fission, spontaneous

• fusion, spontaneous

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In a nuclear reactor the reaction takes place in..

• The control rods

• The fuel rods

• The moderator

• The generator

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Nuclear fusion produces more energy than nuclear fission per unit mass of fuel used.

What issues are there with fusion power generation?

• The isotopes of hydrogen used as a fuel are extremely difficult to source on Earth.

• Massive opposition from environmental groups as a result of the nuclear waste produced from the reaction.

• Requires extremely high temperatures which are difficult to control and highly expensive.

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