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Introducing Sound Waves

Introducing Sound Waves. Ritchel Dyan Z. Bagayas. The Nature of Sound. Sound travels in waves as it moves through the air or some other medium (substance) Waves are produced by a vibrating object.

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Introducing Sound Waves

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  1. Introducing Sound Waves RitchelDyan Z. Bagayas

  2. The Nature of Sound • Sound travels in waves as it moves through the air or some other medium (substance) • Waves are produced by a vibrating object. • As a vibrating object moves outward, it compresses the surrounding medium, producing a region of compression called a condensation. • As the vibrating object then moves inward, the medium expands into the space formerly occupied by the object. This region of expansion is called a rarefaction.

  3. Sound waves consist of these condensations and rarefactions. • Sound waves must travel through a medium. • Sound is called a longitudinal wave because the vibrations are in the same direction as the motion and speed of the wave. • It travels at a speed of 331 m/s in air at 0 oC. • The speed increases, at a rate of 0.6 m/s per Celsius degree. • If something moves faster than sound, it is said to be supersonic. If it travels at the speed of sound, it travels at Mach 1; three times the speed of the sound is called Mach 3.

  4. Acoustics is the science of sound and of its effects on people. • Condensation is a region of compression in a sound wave. • Frequency of sound waves refers to the number of condensation or rarefactions produced by a vibrating object each second. • Decibel is the unit used to measure the intensity level of a sound. A 3000-hertz tone of zero decibels is the weakest sound that the normal human can hear. • Hertz is the unit used to measure frequency. One hertz equals one cycle (vibration) per second. • *Other terms used in the study of sound can be found in page 451.

  5. The nature of a particular sound can be described in terms of • Frequency and Pitch • Intensity and loudness and • Quality

  6. Frequency and Pitch • Pitch is related to its frequency. Higher frequency means higher pitch. • Frequencies of sound waves humans can hear range from about 20-20,000 hertz or cycles per second. • The loudness of sound is related to the wave’s energy or intensity. • As the frequency of sound waves increases, the wavelength decreases. Wavelength is the distance between any point on one wave and the corresponding point on the next one.

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