Grades 9-12: Students begin by investigating the relationships between various properties of light; then, they observe the conversion of electrical energy into light and vice versa.
PHYSICAL SCIENCES (Grades 9-12)
This is actually two labs that work very well in combination. In the first, students investigate the relationships among color, frequency, energy, and wavelength of light using spectroscopes, colored LEDs, phosphorescent, and fluorescent materials. They observe characteristics, measure wavelengths, and observe and calculate photon energies.
The second lab has students investigate the conversion of electrical energy into light and vice versa. It uses electrical measurements on super-bright LEDs to determine the energy of various frequencies (colors) of light. By graphically comparing the energy lost per electron with the frequency of the emitted light for several LED colors, students estimate Plank's constant, a fundamental value in quantum mechanics.
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