Q49 of 269 Page 159

A nuclear power plant is working normally. What would you do it the reactor core suddenly got too hot?

If the reactor core all of a sudden gets too hot then it indicates that the rate of nuclear fission is intensified excessively so in order to reduce the rate of nuclear fission process insert the control rods of boron a little more into the reactor and hence the reactor would start working normally.


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47

A nuclear reaction is represented by the equation :


(a) Name the process represented by this equation and describe what happens during this reaction.


(b) Identify the particle c and the number x of such particles produced in the reaction.


(c) What does E represent?


(d) State two conditions under which such a reaction takes place.


(e) What type of nuclear bomb is based on similar reactions ?

 48

The mass numbers of four elements A, B, C and Dare 2, 20, 135 and 235, respectively. Which one of them will be most suitable to make:

(i) an atom bomb, and


(ii) a hydrogen bomb?

 49

A nuclear reactor has half the length of all its control rods inserted in graphite. What must be done so that the reactor produces more heat? Explain your answer.

 50

Explain why, in a nuclear reactor, the chain reaction stops if the control rods are fully inserted into the graphite.