Fission and Fusion (Leaving Cert Physics): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What happens during nuclear fission?
What happens during nuclear fission?
A heavy nucleus splits into 2 smaller ones
How much energy does each nuclear fission event release?
How much energy does each nuclear fission event release?
About 200 MeV
How many neutrons are typically released per fission event?
How many neutrons are typically released per fission event?
2-3 neutrons
What percentage of natural uranium is uranium-235?
What percentage of natural uranium is uranium-235?
0.7%
What is the critical mass of uranium-235?
What is the critical mass of uranium-235?
About 10 kg
What is the function of the moderator in a nuclear reactor?
What is the function of the moderator in a nuclear reactor?
Slows down fast neutrons
Which materials are used in control rods?
Which materials are used in control rods?
Cadmium or boron
What happens when control rods are inserted deeper into the reactor?
What happens when control rods are inserted deeper into the reactor?
The reaction slows down
What is nuclear fusion?
What is nuclear fusion?
Light nuclei joining to form larger one
What temperature is needed for nuclear fusion?
What temperature is needed for nuclear fusion?
Greater than K
What is a safety advantage of fusion over fission?
What is a safety advantage of fusion over fission?
Stops immediately if conditions fail
What is an environmental advantage of fission reactors?
What is an environmental advantage of fission reactors?
Produce no carbon dioxide emissions