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| wave motion is perpendicular to particle displacement (string vibration) |
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| wave motion is parallel to particle displacement (sound wave) |
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| wavefront consisting of multitude of small, spherical wavefronts or “wavelets” (Huygens Principle); area of small waves produces a plane |
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| area of a pressure wave where particles are most dense or closely packed together as wave propagates, high pressure |
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| area of a pressure wave where particles are most diffuse or spread apart as wave propagates; low pressure |
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| time and phase angle relationship of interacting waves |
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| electric potential or amplitude of a signal from a point of reference (positive or negative) |
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