Answer
In a string of dominoes, the toppling of one domino leads to the fall of another. This, in turn creates a chain reaction that topples all following dominoes. Similarly, the emission of neutrons by one fissionable atom leads to a chain reaction of the emission of more neutrons.
Work Step by Step
In a string of dominoes, the toppling of one domino leads to the fall of another. This, in turn creates a chain reaction that topples all following dominoes. Similarly, the emission of neutrons by one fissionable atom leads to a chain reaction of the emission of more neutrons.
