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Published byBaldwin Mills Modified over 9 years ago
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1 Waves Physical Science Chapter 15
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2 Waves Rhythmic disturbances that carry energy through matter or space.
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3 Medium What a wave travels through Solid Liquid Gas Mechanical waves – require a medium
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4 Electromagnetic waves Do not need a medium to travel through
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As a wave travels Each wave front gets bigger Like the ripples from dropping a rock in a lake Each wave front carries the same amount of energy The energy is spread out over a larger area as the wave gets farther from its source 5
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Source of waves Usually a vibration Like vocal cords or speakers 6
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Simple Harmonic Motion A type of vibration where energy changes form between kinetic and potential, but total energy is conserved. A mass on a spring A clock pendulum 7
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Discuss Why can supernova explosions in space be seen but not heard on Earth? 8
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9 Transverse wave The medium moves at right angles to the direction the wave travels. Crests – the highest points Troughs – the lowest points
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10 Transverse wave http://www.acoustics.salford.ac.uk/feschoo ls/waves/wavetypes.htm#trans http://www.acoustics.salford.ac.uk/feschoo ls/waves/wavetypes.htm#trans
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11 Longitudinal waves The matter vibrates in the same direction as the wave is traveling. Also called compressional waves.
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12 Longitudinal waves http://www.acoustics.salford.ac.uk/feschoo ls/waves/wavetypes2.htm http://www.acoustics.salford.ac.uk/feschoo ls/waves/wavetypes2.htm
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13 Parts of a longitudinal wave Compression – the area where the coils are packed together Rarefaction – the area where the coils are spread apart.
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Surface waves Occur at a boundary between two different mediums, like water and air. Particles move both perpendicularly and parallel to the direction of wave travel. The particles make an elliptical or circular shape. 14
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