Terne, Originally an Alloy of Lead (Pb; R = 154

question 160

Multiple Choice

Terne, originally an alloy of lead (Pb; r = 154 pm, fcc) and tin( Sn; r =140 pm) , appears to contain approximately 7 tin atoms for every 16 lead atoms.Which of the following statements regarding the alloy is correct?

• A)It is probably an interstitial alloy with tin occupying some of the octahedral holes.
• B)It is probably an interstitial alloy with tin occupying some of the tetrahedral holes.
• C)It is probably an interstitial alloy with tin occupying some of the cubic holes.
• D)It is probably a substitutional alloy.
• E)It is approximately 70% Pb and 30% Sn.

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Definitions:

Negative Reinforcement

A behavioral principle where the removal of an unfavorable event or outcome after the display of a behavior increases the likelihood of that behavior being repeated in the future.

Fixed-Ratio Schedule

A schedule of reinforcement where a response is rewarded only after a specified number of responses have been made.

Negative Reinforcement

A process in behavioral psychology where the removal of an undesirable or unpleasant stimulus following a desired behavior increases the likelihood of that behavior being repeated.

Conditioning

A learning process that involves developing associations between events or behaviors and consequential outcomes, such as rewards or punishments.