In her element

Demonstrating electromagnetic radiation, chemistry teacher Delilah Narvaez enlightens her AP Chemistry students Wednesday. The demonstration is designed to show that every element gives off a unique fingerprint of light, so analyzing the frequencies of this light helps identify the chemical that generated it. This procedure is called emission spectroscopy and is a useful scientific tool. It is used in astronomy to study the elements present in stars and in chemical analysis.

Photo credit: Jack Moore