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Question 39

From Physics HL Paper 1A (May 2025, TZ1)

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  1. In a simple model of a nuclear reactor, four neutrons are emitted per fission on average.
    The average number of neutrons absorbed by the control rods is NcN_c per fission.
    The average number of neutrons that are lost through the walls of the reactor is NlN_l per fission.
    Any remaining neutrons induce further fissions.
    What are possible values for NcN_c and NlN_l for the reactor to maintain a steady reaction?
Table showing possible values for Nc and Nl for a nuclear reactor to maintain a steady reaction, with options A-D.
Table showing possible values for Nc and Nl for a nuclear reactor to maintain a steady reaction, with options A-D.

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