A Radioactive Sample Has a Half-Life of 10 Min

question 19

Multiple Choice

A radioactive sample has a half-life of 10 min.What fraction of the sample is left after 40 min?

• A)1/2
• B)1/4
• C)1/8
• D)1/16

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Definitions:

Chemical Energy

The potential of a chemical substance to undergo a transformation through a chemical reaction, resulting in the release of energy.

Kinetic Energy

The energy that a body possesses due to its motion, dependent on the mass of the body and the square of its velocity.

Allosteric Site

A site on an enzyme other than the active site, to which a specific substance binds, thereby changing the shape and activity of the enzyme. Compare with active site.

Receptor Site

specific regions on a cell's surface or within the cell where molecules such as hormones, drugs, or neurotransmitters can bind to elicit a response.