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Archer’s annual STEM Symposium is an opportunity for Los Angeles high school students who have completed independent or small group projects in STEM to present their findings. Students are invited to present their research in the fields of molecular biology, chemistry, physics, and engineering.

The Archer RISE Award honors exceptional young women for their innovative scientific research or engineering design projects that further existing knowledge or develop solutions to pressing scientific challenges. Finalists for the RISE Award are noted in throughout the online program and will be awarded at lunch on May 21.

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Saturday, May 21 • 9:15am - 10:30am
The Absorbance of Energy by Atoms - Quantization and Photoelectric Effect

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When an atom absorbs light or energy, electrons in their ground states get excited to higher states. According to the photoelectric effect, if we input enough energy, the electrons are able to eject from a metal surface. However if we do not meet that threshold energy, electrons will absorb quantized amounts of energy depending upon the electronic structure of the atom. In our experiment, we will create stock solutions of nickel and copper ions and use a visible spectrophotometer to determine the wavelength of visible light absorbed best by the substance in each solution. We will then quantify how the absorbance of the sample is related to the molar concentration of the ion in the solution, according to Beer's Law. Afterwards, we will build an apparatus to eject an electron from a metal surface with a certain amount of energy. We will learn how the ejection of an electron depends on the frequency and intensity of the light/energy source and also be able to measure Planck's constant.

Exhibitors
AB

April Bi

The Webb Schools
The Webb Schools; Grade 10
CD

Christina Dong

The Webb Schools
The Webb Schools; Grade 10


Saturday May 21, 2016 9:15am - 10:30am
Dining Hall

Attendees (1)