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Frequency, Speed and Wavelength
Speed of sound, dry air : 343 metres/second.
Balcony speakers at concert, 25 metres from stage, need 72 milli-seconds delay build-out.
Metric Unit of Frequency : cycle per second or Hertz.
Wavelength = Speed / Frequency. For example, 1 kHz has wavelength 34.3 metres.
What frequency range can you hear ?
What frequency difference can you distinguish ?