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Light as a Wave

Light as a Wave

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Light as a Wave

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Presentation Transcript

  1. Light as a Wave The EM Spectrum, Diffraction, Interactions with Matter, and Young’s Double Slit Experiment

  2. Light is a Wave • Reflects • Refracts • Diffracts • Interferes • Is Absorbed

  3. The EM Spectrum • Regions with longer wavelengths have greater ability to diffract • Regions with high frequencies • Behave more like particles only • Can cause great damage to living things

  4. Visible Light • White light forms the continuous spectrum of visible light • Visible Spectrum made up of all colors • Colors have different wavelengths • red has longest wavelength (700 nm) • violet the smallest (400 nm) • (1 nm = 0.000000001 m) • If the spectrum was scaled to 2000 miles, visible light would only be one inch of it

  5. Wavelength vs Frequency • If red has the longest wavelength, and violet has the shortest, which has the greater velocity? • Neither - Trick question! Both are light, so both travel at the speed of light! But…. • Which has the highest frequency? • Yep, violet!

  6. Refraction of light rays happens when light changes mediums.

  7. Interference can be demonstrated with light through Young’s Double Slit Experiment. Proves light particles can behave like waves.

  8. Matter and Light • Luminous objects emit light • Incandescent, fluorescent bulbs, neonlight, “black” light, laser light • Because of excited atoms • Illuminated objects are objects that are reflecting light produced by another source. • The moon is illuminated by the sun • A white projector screen is illuminated by the projector

  9. Matter and Light • Transparent objects transmit light easily • Air, glass • Light entering/exiting a medium changes its speed • There can be scattering (blue sky) and/or refraction (prism) • Opaque objects (non-luminous) do not emit or transmit light, instead they: • reflect • absorb