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Nuclei

Question
CBSEENPH12047782
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The operation of a nuclear reactor is said to be critical, if the multiplication factor (k) has a value

  • 1

  • 1.5

  • 2.1

  • 2.5

Solution

A.

1

The multiplication factor (k) is an important reactor parameter and is the ratio of number of neutrons present at the beginning of a particular generation to the number present at the beginning of the next generation. It is a measure of the growth rate of the neutrons in the reactor. For k =l, the operation of the reactor is said to be critical.

 Note: If k becomes greater than one, the reaction rate and the reactor power increase exponentially. Unless the factor k is brought down very close to unity, the reactor will become supercritical and can even explode.

Some More Questions From Nuclei Chapter

The above is a plot of binding energy per nucleon Eb, against the nuclear mass M; A, B, C, D, E, F correspond to different nuclei. Consider four reactions:

(i) A + B → C + ε  (ii) C → A + B + ε
(iii) D + E → F + ε and (iv) F → D + E +ε

where ε is the energy released? In which reaction is ε positive?

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