Shea on Frequency:
- The number of occurrences of a wave per second
- The unit for frequency is Hertz (Hz)
- 20 kHz is shorthand for 20,000 Hz
- Audible frequency range is 20 Hz to 20 kHz
- What is perceived as "pitch" is determined by the frequency of the sound wave
- Male voice: 100 Hz to 8 kHz
- High female voice: 180 to 10 kHz
- Low frequencies in the natural world: distant thunder, earthquakes, other natural catastrophe. Low frequency rumble often denotes a threat thus the four bass notes as the shark's theme in Jaws.
- High frequency: sometimes associated with serenity, peacefulness
- Infrasonic: below 20 Hz. Frequencies around 12 Hz can cause nausea. This was not the case when Mythbusters tested it.
- Ultrasonic: Frequency region above 20 kHz. Have to watch very high frequency sounds on a set (e.g. video monitors that emit strong acoustic energy at around 16,000 Hz)
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The Relationship between frequency and wavelength is this: Wavelength is the measurement of a sound wave from the apex of one wave to the apex of the next. This corresponds to frequency in that the shorter the wavelength, the higher the frequency.
