Chapter-16 (continued). 16.5 The Nature of Sound Longitudinal Sound Waves Sound in air is a longitudinal wave that is created by a vibrating object, such.

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Presentation transcript:

Chapter-16 (continued)

16.5 The Nature of Sound Longitudinal Sound Waves Sound in air is a longitudinal wave that is created by a vibrating object, such as a guitar string, the human vocal cords, or the diaphragm of a loudspeaker.

Sound cannot propagate in a vacuum

How do we hear?

Wave Picture

Graphic representations of a sound wave. Air at equilibrium, in the absence of a sound wave; Compressions and rarefactions that constitute a sound wave; Transverse representation of the wave, showing amplitude (A) and wavelength (λ). Name the x axis? What are the choices for the y-axis? Draw a transverse representation of a wave, name the axes, and show period.

The Frequency of a Sound Wave Audible Range: 20 Hz ,000 Hz.

The Frequency of a Sound Wave Audible Range: 20 Hz ,000 Hz. Infrasonic waves: Sound waves with frequencies < 20 Hz. Rhinoceroses use infrasonic frequencies as low as 5 Hz to call one another

The Frequency of a Sound Wave Audible Range: 20 Hz ,000 Hz. Infrasonic waves: Sound waves with frequencies < 20 Hz. Rhinoceroses use infrasonic frequencies as low as 5 Hz to call one another Ultrasonic waves: Sound waves with frequencies > 20,000 Hz. Bats use ultrasonic frequencies up to 100 kHz for locating their food sources and navigating.

Objective and Subjective properties of sound Objective properties can be measured, used in physics. Subjective properties are subjective to the person, used in music. Objective propertySubjective quality FrequencyPitch IntensityLoudness WaveformTymbre or Quality

16.6 The Speed of Sound

Table 16.1 Speed of Sound (m/s) Gases Air (0 °C) 331 Air (20 °C) 343 Carbon dioxide (0 °C) 259 Oxygen (0 °C) 316 Helium (0 °C) 965 Liquids Chloroform (20 °C) 1004 Ethyl alcohol (20 °C) 1162 Mercury (20 °C) 1450 Fresh water (20 °C) 1482 Seawater (20 °C) 1522 Solids Copper 5010 Glass (Pyrex) 5640 Lead 1960 Steel 5960

16.7 Sound Intensity The sound intensity I is defined as the sound power P that passes perpendicularly through a surface divided by the area A of that surface: The unit of sound intensity is power per unit area, or W/m 2.

Human Ear and Sensitivity Audible frequency range: 20 Hz – 20,000 Hz Audible intensity range: 10 –12 W/m w/m 2 10 –12 W/m 2 = Threshold of hearing 10 W/m 2 = Threshold of pain

16.8 Decibels The decibel (dB) is a measurement unit used when comparing two sound intensities. The intensity level  (expressed in decibels) relative to the threshold of hearing, I o is defined as follows:

TABLE 16.2 Typical Sound Intensities and Intensity Levels Relative to the Threshold of Hearing Intensity I (W/m 2 ) Intensity Level  (dB) Threshold of hearing1.0 × Rustling leaves1.0 × Whisper1.0 × Normal conversation (1 meter)3.2 × Inside car in city traffic1.0 × Car without muffler1.0 × Live rock concert Threshold of pain10130