For fast chain reaction, the size of `U^(235)` block, as compared to its critical size, must be

Define critical size.

In a critical chain reaction

In a critical chain reaction

What do you mean by critical size?

The size of obstacle in order to observe diffraction of light must be

Chain reaction is possible , only if the size of system is ___________ the critical size.

For a chain nuclear fission of U^(235) the moderation of neutron is a must because very high energy neutron