When a Neutron Collides with a Uranium-235 Nucleus It Can $\begin{array} { c } 235 \\92\end{array}$

question 8

Multiple Choice

When a neutron collides with a uranium-235 nucleus it can induce a variety of fission reactions. One such reaction is $\begin{array} { c } 235 \\92\end{array}$ U + $\begin{array} { l } 1 \\0\end{array}$ n ? $\begin{array} { c } 140 \\54\end{array}$ Xe + $\begin{array} { l } 94 \\38\end{array}$ Sr + 2 $\begin{array} { l } 1 \\0\end{array}$ n The following mass values are known: $\begin{array} { c } 140 \\54\end{array}$ Xe: 139.921620 u $\begin{array} { l } 94 \\38\end{array}$ Sr: 93.915367 u $\begin{array} { c } 235 \\92\end{array}$ U: 235.043924 u $\begin{array} { l } 1 \\0\end{array}$ n: 1.008665 u
What mass of uranium is needed to produce a 10-kiloton yield? (1 u = 931.5 MeV/c² = 1.66054 × 10^-27 kg, 1-kiloton yield = 5.0 × 10¹² J)

• A)0.57 kg
• B)0.66 kg
• C)6.58 kg
• D)3.85 kg
• E)1.10 kg

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Definitions:

Variable-Interval

A reinforcement schedule in which a reward is given after a random duration of time has elapsed following a response.

Fixed-Interval

In this reinforcement strategy, rewards are only allocated for the first response following a specified duration.

Fixed-Ratio

A reinforcement schedule wherein a reward is given after a predetermined number of responses have been made.

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