Fingerprinting: Commercial Products and Elements
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DeeDee Allen [1] ; Maria T. Oliver-Hoyo [1]
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[1] North Carolina State University
North Carolina State University
Township of Raleigh, Estados Unidos
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- Localización: Journal of chemical education, ISSN 0021-9584, Vol. 79, Nº 4, 2002, pág. 459
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
Correlation between commercial bar codes and element emission spectra gives rise to an activity that relates the familiarity of everyday things to a chemical concept. The analogy between bar codes found in everyday items and absorption-emission spectra emerges from the fact that both contain information in the form of lines and those lines identify a specific product or element. Bar codes are most commonly read by computerized scanners, which obtain a reflectance pattern from the line widths of a bar code. Emission spectra are similar to these reflectance patterns. In the activity entitled "Fingerprinting", students interpret bar code patterns and use the properties of bar code symbols to identify the properties of emission spectra.
