Edexcel IGCSEPhysicsGeneral Applications6 Marks
Describe the process of nuclear fission and explain how a chain reaction can occur.
- (a)Describe nuclear fission.[3]
- (b)Explain how a chain reaction occurs during nuclear fission.[3]
Mark scheme
Marking points from the official mark scheme. The mark or mark type is shown in brackets.
- 6(a) M1 for (large unstable) nucleus / atom / isotope
- A1 for splits into two (smaller) daughter nuclei / lighter nuclei / products
- A1 for (due to absorption of a) neutron / slow neutron
- 6(b) M1 for (fission) releases (more) neutrons
- A1 for these (released) neutrons hit / cause fission in other (unstable) nuclei
- A1 for causing more fission / continuous process (leading to a self-sustaining reaction)
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