Neutrons Produced in the Fission of Uranium Are Rapidly Moving

question 16

Multiple Choice

Neutrons produced in the fission of uranium are rapidly moving projectiles and must be slowed before they can produce more fission.If the neutrons collide elastically,hydrogen is effective in slowing them down because

• A)hydrogen atoms repel neutrons.
• B)a hydrogen atom is much more massive than a neutron.
• C)a hydrogen atom and a neutron have about the same mass.
• D)a neutron is much more massive than a hydrogen atom.
• E)hydrogen atoms attract neutrons.

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Definitions:

Variances

The quantitative measure of the difference between actual and expected behavior, often used in finance to assess volatility of returns or tracking errors.

Covariances

An indicator of the extent to which two variables fluctuate in tandem.

Risky Securities

Financial instruments carrying a higher potential for loss, often offering greater potential returns to compensate for the increased risk.

Portfolio Variance

A measure of the dispersion of returns of a portfolio, calculated as the weighted average of the covariance of each asset in the portfolio.