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WAVES
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Waves transfer energy without transferring matter.
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Longitudinal Wave (Compression Wave)
wave particles vibrate back and forth along the path that the wave travels.
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Compressions = The close together part of the wave (regions of high density).
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Rarefactions = The spread-out parts of a wave
(regions of low density).
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Wavelength = the distance between successive rarefactions or successive compressions.
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Longitudinal/Compression Wave Examples
Sound Music Earthquake (p-wave) Compressed and stretched slinky
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Transverse waves wave particles vibrate in an up-and-down motion.
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Picture of a Transverse Wave
Crest l Wavelength A A - Amplitude Trough Baseline
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Wavelength (l)= Units - meters
Distance between adjacent crests in a transverse wave Distance a wave travels during one vibration Units - meters
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Transverse Wave Description-
Frequency (f)- the number of vibrations per unit of time made by the vibrating source. Unit – 1/s = Hertz (Hz) Amplitude- Height of a wave, from the baseline to the crest or trough.
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Transverse Wave Examples
Electromagnetic Waves The Wave Earthquake (s-wave) Slinky (up down)
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Wave interactive animation.com/electricity_electromagnetism_interactive/oscilloscope_de scription_tutorial_sounds_frequency.htm
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Chrome Music Lab
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Electromagnetic Spectrum
Electromagnetic Spectrum --The type of radiation is based on the waves wavelength and only the wavelength.
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Visible Light: Color
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The Electromagnetic Spectrum
ROY G BIV = Visible Light in of decreasing wavelength Maxwell - (c. 1864) light is an EM wave
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Dispersion… Color separates using a prism because different colors have different wavelengths. Red light bends the least and purple light bends the most.
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Colored lights combine to appear white.
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Colored lights add to become white.
Why then do paints add to become black?
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Answer: paints are pigments.
Pigments are chemicals which are capable of absorbing one or more frequency of white light.
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Inverted Color or Negatives
Allows you to see the light being absorbed vs reflected.
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Reflection= Light reflects when it bounces off the surface of a material
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Refraction= The Bending of light as it passes through a substance. The shape of the lens determines how the light behaves.
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