The Original Reactor Built in 1942 Was Just "Barely" Critical

question 42

Multiple Choice

The original reactor built in 1942 was just "barely" critical because the natural uranium that was used contained less than 1% of the fissionable isotope U-235 (half life 713 million years) .What if,in 1942,the Earth had been 9 billion years old instead of 4.5 billion years old? Would this reactor have reached critical stage with natural uranium? Why?

• A)No.The age of the Earth has nothing to do with the reactor reaching critical stage with U-235.
• B)No.1% of the fissionable isotope U-235 is insufficient for the reactor to reach critical stage no matter what the age of the Earth.
• C)Yes.If the Earth had been twice as old there would have then been twice as much fissionable U-235 present and the reactor would have reached critical stage.
• D)No.The increased age of the Earth would mean that there would be a much smaller percentage of U-235,thus not enough for the reactor to reach critical stage.

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Definitions:

Workers

Individuals engaged in physical or mental activity in order to achieve a result, often employed for wages.

Units

The standard measurement or quantity in which a product, service, or statistic is counted or expressed.

Marginal Cost

The cost of producing one additional unit of a good or service.

Total Costs

The complete sum of all expenses incurred by a business in producing goods or services, including fixed and variable costs.