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Question EXE.2.SL.TZ0.18a

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Date Example questions Example questions Marks available [Maximum mark: 3] Reference code EXE.2.SL.TZ0.18a
Level SL Paper 2 Time zone TZ0
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 3]
EXE.2.SL.TZ0.18a
(a)

Outline, with reference to the decay equation above, the role of chain reactions in the operation of a nuclear power station.

[3]

Markscheme

The four neutrons released in the reaction may initiate further fissions ✓ 

«If sufficient U-235 is available,» the reaction is self-sustained ✓ 

Allowing for the continuous production of energy ✓

The number of neutrons available is controlled with control rods «to maintain the desired reaction rate» ✓

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