Title: Einstein Demonstrations- Light Defraction
This demonstration exhibits light’s wave-like characteristics. This is half of light’s duality; the other half being light’s particle-like characteristics. Using diffraction gratings we can compare the visible parts of atomic spectra for different elements. A diffraction grating consists of a large number of equally spaced parallel slits. These slits bend light differently according to wavelength. Incandescent lights work by heating a solid piece of tungsten wire. This heating of a solid produces a variety of wavelengths, giving an impressive spread of colors when viewed with a diffraction grating. Since the other lamps are single gaseous elements, they emit only a few wavelengths of light, their individual atomic spectra. Standard(s):
[SC2015] PS8 (8) 17: Create and manipulate a model of a simple wave to predict and describe the
relationships between wave properties (e.g., frequency, amplitude, wavelength)
Title: Reading in the Dark
In this Science Update, from Science NetLinks, you'll hear about the possible effects of reading in low light. Science Updates are audio interviews with scientists and are accompanied by a set of questions as well as links to related Science NetLinks lessons and other related resources.
Standard(s): [S1] A&P (9-12) 8: Identify structures of the nervous system.