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... waves (energy) transmitted in a fluid medium, such as air . these pressure waves cause the ear drum to vibrate and create the ... period , amplitude ( intensity ), speed , and direction . air vibrations/sounds with frequencies in the approximate range of 20 to ...
Publication | 2011-08-22
... and licenses; the tariff administration group, the air travel complaint administration, and the international agreements team. ... and licenses; the tariff administration group, the air travel complaint administration, and the international agreements team. ...
Publication | 2011-08-11