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This question is about nuclear reactions - Edexcel - GCSE Physics - Question 3 - 2021 - Paper 1
Question 3
This question is about nuclear reactions. (a) When a uranium-235 (U-235) nucleus absorbs a neutron, the nucleus splits into smaller parts. This reaction is called ... show full transcript
Worked Solution & Example Answer:This question is about nuclear reactions - Edexcel - GCSE Physics - Question 3 - 2021 - Paper 1
Step 1
Step 2
Describe what is meant by a chain reaction.
Answer
A chain reaction occurs when the products of a nuclear reaction, such as the neutrons emitted during fission, cause additional reactions to occur.
Explanation of Chain Reaction:
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Initial Reaction: When a uranium-235 nucleus absorbs a neutron, it becomes unstable and splits, releasing energy, additional neutrons, and fission products.
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Neutron Emission: The emitted neutrons can then go on to collide with other nearby uranium-235 nuclei.
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Continued Fission: If these neutrons are absorbed by other U-235 nuclei, it may cause them to fission as well, which in turn releases more neutrons.
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Sustained Process: This process can continue, leading to a self-sustaining series of reactions, known as a chain reaction.
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Energy Release: The energy released can be harnessed for power generation but needs to be controlled to avoid an uncontrolled reaction, such as in an atomic bomb.
A diagram illustrating this process could include arrows showing neutrons triggering further fissions.