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Sound Basics

Explore the basics of sound, including its properties like frequency and amplitude, and how it propagates through air. Learn about the speed of sound, intensity, wavelengths, and the relationship between frequency and period. Dive into audio senses and assignments to enhance your understanding.

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Sound Basics

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  1. Sound Basics

  2. What is sound? • American Heritage dictionary: "A vibratory disturbance in the pressure and density of a fluid, or in the elastic strain in a solid, with frequency in the approximate range between 20 and 20,000 cycles per second, and capable of being detected by the organs of hearing.“

  3. Sound Propogation • Air particles in compression/rarefaction when viewed from a single point • We can graph as a “waveform”

  4. Frequency • Sound is a cyclic phenomenon • Frequency is the number of cycles occurring in one second. • Measured in Hertz (after Mr. Hertz) • Also known as Pitch

  5. Getting to know Frequency • Listen to frequencies • View frequencies MAC Oscope

  6. Speed of Sound • Speed 1130 ft/sec at 59°F, or “Standard Temperature” • Travels roughly 1 mS/Foot • Remember this number!!!

  7. Intensity • Intensity or amplitude = loudness • Measured in deciBels (dB) to correspond with the way our ears perceive loudness

  8. Wavelength • Length of one cycle is the distance per second divided by the frequency in cycles per second • Speed of sound changes with air temperature

  9. What is the wavelength of a 1000Hz sound wave?

  10. What is the wavelength of a 1000Hz sound wave?

  11. What is the wavelength of a 60Hz sound wave?

  12. What is the wavelength of a 6000Hz sound wave?

  13. Period • Frequency is Cycles per Second • Period is time one cycle takes • Period is inverse of frequency

  14. What is the period of a 1000Hz sound wave?

  15. Sound exists in time

  16. Ears can not be turned off

  17. Senses • Live Entertainment works for primarily two senses: sight and hearing. • Sets/Costume/Lighting work for sight, only sound works for hearing.

  18. Assignment • Read Chapter 2 • Homework: Calculate the wavelengths of the following frequencies: • 92Hz • 1630Hz • 9504Hz

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