PSY280H5 Lecture 10: PSY280 Lecture 10 Notes.docx
Document Summary
What is sound: vibrations on objects create sound, example: speakers, vibration forces air molecules and particles to move, vibrations cause fluctuations in air pressure, speed of sound through air: 340 m/s, travels faster through water: 1500 m/s, travels in sound waves in air changes in ambient levels. 20 20000 hz is available to our hearing: distinctive qualities about frequency related to pitch, there are low pitch and high pitch sounds, as we change the frequency of a sounds we change our perception of the qualities of that sound, frequency= pitch, amplitude= magnitude. 1 db represents 20 log (pressure/ambient pressure of the environment (po)) environment, 6 db of sound is increased: we are not equally sensitive to all frequencies of sound, speaking: 3000 to 600 khz range, upper limit: 20,000 up until age 10 until you receive a fair bit of auditory pollution, pressure difference perceived less at 60 than 2 2000 khz.
