Wood Deposits Recovered from an Archeological Site Contain 25% of the Carbon

question 119

Multiple Choice

Wood deposits recovered from an archeological site contain 25% of the carbon 14 they originally contained. How long ago did the tree from which the wood was obtained die? Hint: the decay constant k for carbon 14 is equal to 0.00012.

• A) The tree died 10,429 year(s) ago.
• B) The tree died 11,552 year(s) ago.
• C) The tree died 13,084 year(s) ago.
• D) The tree died 8,096 year(s) ago.

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Definitions:

Datum

A reference point, line, or surface on an object used as a basis for geometric calculations, measurements, or to define a coordinate system.

Datum Feature

An exact point, axis, or plane upon which dimensions are based or measurements are taken in technical drawings.

Surface Plate

A flat, rigid plate used as a reference plane for precision inspection, marking, and layout of materials in machining and quality control operations.

Primary Datum

A reference point, axis, or plane from which dimensions are measured or a baseline for the construction of geometric features in drawings.