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1. Light Diffraction |
| Light exhibits wave-like behavior, allowing diffraction like rainbows |
| Spectral Lamps (Tungsten, Neon, Mercury Vapor, Sodium Vapor, Hydrogen and Helium) |
| 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. |
| 5 minutes |
| 4th –3; 5th – 5; 8th – 12 |
1. Light Diffraction
2. Photo-Electric Effect
3. Photo-Electric Effect in Action
4. General Relativity
5. Speed of Light
6. Color Mixing
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| Download
Teacher Guide (PDF 4.5 MB) |
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