BIO WAVES ON VOCAL FOLDS. In the larynx, sound is produced by the vibration of the vocal folds (also called “vocal cords”). The accompanying figure is a cross section of the vocal tract at one instant in time. Air flows upward (in the + z -direction) through the vocal tract, causing a transverse wave to propagate vertically upward along the surface of the vocal folds. In a typical adult male, the thickness of the vocal folds in the direction of airflow is d = 2.0 mm. High-speed photography shows that for a frequency of vibration of f = 125 Hz, the wave along the surface of the vocal folds travels upward at a speed of υ = 375 cm/s. Use t for time, z for displacement in the + z -direction, and λ for wavelength. 15.78 What is the wavelength of the wave that travels on the surface of the vocal folds when they are vibrating at frequency f ? (a) 2.0 mm; (b) 3.3 mm; (c) 0.50 cm; (d) 3.0 cm.
BIO WAVES ON VOCAL FOLDS. In the larynx, sound is produced by the vibration of the vocal folds (also called “vocal cords”). The accompanying figure is a cross section of the vocal tract at one instant in time. Air flows upward (in the + z -direction) through the vocal tract, causing a transverse wave to propagate vertically upward along the surface of the vocal folds. In a typical adult male, the thickness of the vocal folds in the direction of airflow is d = 2.0 mm. High-speed photography shows that for a frequency of vibration of f = 125 Hz, the wave along the surface of the vocal folds travels upward at a speed of υ = 375 cm/s. Use t for time, z for displacement in the + z -direction, and λ for wavelength. 15.78 What is the wavelength of the wave that travels on the surface of the vocal folds when they are vibrating at frequency f ? (a) 2.0 mm; (b) 3.3 mm; (c) 0.50 cm; (d) 3.0 cm.
BIO WAVES ON VOCAL FOLDS. In the larynx, sound is produced by the vibration of the vocal folds (also called “vocal cords”). The accompanying figure is a cross section of the vocal tract at one instant in time. Air flows upward (in the +z-direction) through the vocal tract, causing a transverse wave to propagate vertically upward along the surface of the vocal folds. In a typical adult male, the thickness of the vocal folds in the direction of airflow is d = 2.0 mm. High-speed photography shows that for a frequency of vibration of f = 125 Hz, the wave along the surface of the vocal folds travels upward at a speed of υ = 375 cm/s. Use t for time, z for displacement in the +z-direction, and λ for wavelength.
15.78 What is the wavelength of the wave that travels on the surface of the vocal folds when they are vibrating at frequency f? (a) 2.0 mm; (b) 3.3 mm; (c) 0.50 cm; (d) 3.0 cm.
A horizontal wire is stretched with a tension of 94.0 N, and the speed of transverse waves for the wire is 406 m/s. What must the amplitude of a traveling wave of frequency 69.0 Hz be for the average power carried by the wave to be 0.365 W?
Choices:
7.23mm
4.10mm
5.00mm
8.45mm
Two waves are traveling in the same medium and described by the following wave functions: y 1 =0.01 m sin(0.3 pi x-20t) and y 2 =0.01 m sin(0.3 pi x-20t) where x and y are measured in centimeters and t is in seconds. Find the maximum transverse velocity of the element of the medium located at x = 2.3 cm.
Male Rana catesbeiana bullfrogs are known for their loud mating call.The call is emitted not by the frog’s mouth but by its eardrums, which lie on the surface of the head. And, surprisingly, the sound has nothing to do with the frog’s inflated throat. If the emitted sound has a frequency of 260 Hz and a sound level of 85 dB (near the eardrum), what is the amplitude of the eardrum’s oscillation? The air density is 1.21 kg/m3.
Chapter 15 Solutions
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