The phenomenon of nuclear fission can be carried out both in a controlled and in an incontrolled way. Out of the following, the correct statements vis-à-vis these phenomens are:

Options

A. The fission energy released per reaction is much more than conventional nuclear reactions and one of the products of the reaction is that very particle which initiates the reaction.
B. It is the ''surface to valume'' ratio of the sample of nuclear fuel used which determines whether or not the reaction would sustain itself as a 'chain reaction''.
C. The ''control rods'' in a nuclear reactor must be made of a material that absorbs neutorns effectively.
D. The energy released per fission as well as energy released per unit mass of the fuel in nuclear fission are both greater than the corresponding quantities for nuclear fusion.

Answer

a,b,c

Explanation

The last staement is incorrect because the amount of energy released per unit mass of the fuel is much more for fusion than for fission. Hence, (a),(b) (c ) are correct.