*$_In order to have constant chain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be?

*$_In order to have constant chain reaction to produce a constant rate

1.	*$_In order to have constant chain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be?
A.	Greater than 1.0
B.	Less than 1.0
C.	Equal to zero
D.	Equal to 1.0
Answer» E.