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Textbook Expert
Textbook ExpertVerified Tutor
29 Dec 2021

Given information

The collisions must it make to reach thermal energy

                                                       

                                                         

Step-by-step explanation

Step 1.
Let us consider that ,        
                             
 
The energy of a released neutron following collision is proportional to the starting energy and can be written as,
                                           
                                                           
We will be able to develop an expression for the number of fissions by using the properties of natural logarithm.
                                       
                                                 

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