Nuclear Fission & Fusion (OCR GCSE Physics A (Gateway Science Suite)): Flashcards
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What can start a chain reaction?
What can start a chain reaction?
Neutrons
What type of energy do fission neutrons have?
What type of energy do fission neutrons have?
Kinetic energy
What absorbs neutrons in chain reactions?
What absorbs neutrons in chain reactions?
Large, unstable nuclei
What happens when a nucleus absorbs a neutron?
What happens when a nucleus absorbs a neutron?
Fission reaction occurs (chain reaction)
Why are chain reactions dangerous?
Why are chain reactions dangerous?
Very difficult to stop; many neutrons produced per fission
What controls fission in nuclear reactors?
What controls fission in nuclear reactors?
Control rods
What do control rods do?
What do control rods do?
Absorb excess neutrons
Why does absorbing neutrons help control reactors?
Why does absorbing neutrons help control reactors?
Limits the number of fission reactions
What type of reactions occur in nuclear weapons?
What type of reactions occur in nuclear weapons?
Uncontrolled fission reactions
What is the outcome of an uncontrolled chain reaction?
What is the outcome of an uncontrolled chain reaction?
Explosion
Where are control rods located?
Where are control rods located?
Inside the nuclear reactor
How many neutrons does each fission produce?
How many neutrons does each fission produce?
Many (multiple neutrons)