Sound

    Cards (9)

    • Compression is a region where the air particles are closer together, resulting in air pressure higher than normal atmospheric pressure.
    • Rarefaction is a region where the air particles are further apart, resulting in air pressure lower than normal atmospheric pressure.
    • Loudness relates to amplitude.
    • Pitch relates to frequency.
    • audible and inaudible sound:
      infrasound: 0-20Hz
      human: 20-20000Hz
      dogs: 20-100000Hz
      ultrasound: 20000-1000000+Hz
    • Reflection of sound is called an echo.
    • Sonar (sound, navigation and ranging) technology, imaging internal organs and breaking up kidney stones and cancer treatment are all under ultrasound.
    • Sound waves are a longitudinal wave which needs a medium to propagate
    • Sound waves can measure the depth of sea floor, find fishes, medical imagine and breaking up kidney stones
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