device to record the direction of waves at a particular path
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- shearing motions that are at right angles to the direction of wave propagation, ... A seismograph is a device used to: ... (c) record the vibrations produced during an earthquake. (d) calm ...
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Sound vibrations, then, travel outwards in all directions in waves from a sound source. As they travel outwards the energy they contain becomes dissipated and therefore the sound becomes weaker the further it is from the source. The shape of a sound wave with no obstacles in its way would be approximately spherical.
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