If a 20-MeV Neutron Released in a Fission Reaction Loses Half Its

question 38

Multiple Choice

If a 2.0-MeV neutron released in a fission reaction loses half its energy in each moderator collision, how may collisions are needed to bring it to (1/25) eV?

• A) 6
• B) 18
• C) 26
• D) 30
• E) 4

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Definitions:

Histogram

A graphical display of data using bars of different heights to show the frequency distribution of a dataset.

Median

The middle value in a set of data when it is arranged in ascending or descending order, or the average of the two middle numbers if the set has an even number of observations.

Skewed

A distribution that is not symmetrical, indicating that the data tends to lean towards the left (negatively skewed) or right (positively skewed) of the average.

Histogram

A graphical representation of the distribution of numerical data, usually showing frequency of data intervals.