BIO Waves on vocal cords. In the larynx, sound is produced by the vibration of the vocal cords. The diagram in Figure 12.44 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 cords. In a typical adult male, the thickness of the vocal cords 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 cords travels upward at a speed of u = 375 cm/s. Take t to be time, z to be displacement in the + z direction, and λ to be wavelength. Figure 12.44 Problems 72–74. 72. What is the wavelength of the wave that travels on the surface of the vocal cords 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 cords. In the larynx, sound is produced by the vibration of the vocal cords. The diagram in Figure 12.44 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 cords. In a typical adult male, the thickness of the vocal cords 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 cords travels upward at a speed of u = 375 cm/s. Take t to be time, z to be displacement in the + z direction, and λ to be wavelength. Figure 12.44 Problems 72–74. 72. What is the wavelength of the wave that travels on the surface of the vocal cords 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 cords. In the larynx, sound is produced by the vibration of the vocal cords. The diagram in Figure 12.44 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 cords. In a typical adult male, the thickness of the vocal cords 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 cords travels upward at a speed of u = 375 cm/s. Take t to be time, z to be displacement in the + z direction, and λ to be wavelength.
Figure 12.44 Problems 72–74.
72. What is the wavelength of the wave that travels on the surface of the vocal cords when they are vibrating at frequency f?
The four strings of a bass guitar are 0.865 m long and are tuned to the notes G (98 Hz), D (73.4 Hz), A (55 Hz), and E (41.2 Hz). In one bass guitar, the G and D strings have a linear mass density of 5.8 g/m, and the A and E strings have a linear mass density of 26.8 g/m. What is the total force exerted by the strings on the neck?
If a solid bar is struck at one end with a hammer, a longitudinal pulse propagates down the bar. Find the speed of sound in a bar of aluminum, which has a Young’s modulus of 4.7 x1010 Pa and a density of 1.7 x 103 kg/m3
A sound wave arriving at your ear is transferred to the fluid in the cochlea. If the intensity in the fluid is 0.410 times that in air and the frequency is the same as for the wave in air, what will be the ratio of the pressure amplitude of the wave in air to that in the fluid? Approximate the fluid as having the same values of density and speed of sound as water. Speed of sound in dry air (20.0°C, 1.00 atm) is 343 m/s, density of dry air (at STP) is 1.29 kg/m3, density of water is 1000 kg/m3, and speed of sound in water is 1493 m/s.
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Wave Speed on a String - Tension Force, Intensity, Power, Amplitude, Frequency - Inverse Square Law; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=vEzftaDL7fM;License: Standard YouTube License, CC-BY