Why Is Carbon Better Than Lead as a Moderator in Nuclear

question 94

Multiple Choice

Why is carbon better than lead as a moderator in nuclear reactors?

• A)Carbon produces the high energy,high speed neutrons necessary for maintaining the nuclear chain reaction.
• B)Carbon slows down the neutrons making them more effective in stimulating the nuclear chain reaction.
• C)Lead absorbs the neutrons rather than allowing them to rebound to maintain the nuclear chain reaction.
• D)Lead slows down the neutrons making them less effective in stimulating the nuclear chain reaction.

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Definitions:

Efficiency Variance

A measure used in cost accounting to evaluate the efficiency of resource usage, calculated as the difference between actual usage and the standard or expected usage.

Materials Price Variance

The variance between the standard cost and the actual expense of materials, calculated by multiplying the amount bought.

Direct Materials

Raw materials that are directly traceable to the production of a specific product, representing a significant portion of the costs of goods sold.

Variable Overhead Rate Variance

The difference between the actual variable overhead costs incurred and the expected costs based on the predetermined overhead rate.