Indicate the number of significant figures in each of the following. a. this book contains more than 1000 pages.

b. A mile is about 5300 ft

c. a liter is equivalent to 1.059

d. the population of the us is approaching 3.0 × 10^2 million

e. a kilogram is 1000 g.

f. the Boeing 747 cruises at around 600 mi/h

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it is the minimum amount of material needed to sustain a fission reaction.

critical mass is the minimum amount of fissionable material that must be assembled for a sustained fission reaction to take place. although two to three neutrons are produced for every fission, not all of these neutrons are available for continuing the fission reaction. if the conditions are such that the neutrons are lost at a faster rate than they are formed by fission, the chain reaction will not be self-sustaining.   at the point where the chain reaction can become self-sustaining, this is referred to as critical mass.