cross section
Definition
- Noun:
- A representative sample of a group or population: A "cross section" is a group of people or things selected from a larger group to represent its characteristics.
- A surface or shape exposed by cutting through something, especially at right angles to an axis: In geometry and other sciences, a "cross section" is the flat, two-dimensional shape you would see if you sliced through a solid object.
- (Physics) A measure of probability for a specific particle interaction: In physics, a "cross section" quantifies the likelihood of a particular event, such as absorption or scattering, occurring between particles.
Usage Examples
Noun (Representative Sample): The survey interviewed a cross section of American voters. The committee included a cross section of experts from different fields.
Noun (Shape from a cut): The diagram shows the cross section of a tree trunk, revealing its annual rings. Engineers studied the cross section of the beam to assess its strength.
Noun (Physics): The neutron absorption cross section of that isotope is very high. Scientists measured the collision cross section for the experiment.
Advanced Usage
- "to be a cross section of": to represent the different types within a whole.
Variants and Related Words
- Cross-sectional (adjective): Relating to or based on a cross section.
Synonyms
- Sample: A small part intended to show what the whole is like.
- Profile: The outline of a shape, especially as seen from the side.
- Slice: A thin, broad piece cut from a larger object.
Related Phrases
- Representative cross section: A sample that accurately reflects the diversity of the whole population.
Noun
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(physics) the probability that a particular interaction (as capture or ionization) will take place between particles; measured in barns
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a sample meant to be representative of a whole population
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a section created by a plane cutting a solid perpendicular to its longest axis
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