Chapter 12: Q7MCQ (page 328)
When a sound wave passes from air into water, what properties of the wave will change?
(a) Frequency.
(b) Wavelength.
(c) Wave speed.
(d) Both frequency and wavelength.
(e) Both wave speed and wavelength.
The correct option is (e).
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Traditional methods of protecting the hearing of people who work in areas with very high noise levels have consisted mainly of efforts to block or reduce noise levels. With a relatively new technology, headphones are worn that do not block the ambient noise. Instead, a device is used which detects the noise, inverts it electronically, then feeds it to the headphones in addition to the ambient noise. How could adding more noise reduce the sound levels reaching the ears?
In which of the following is the wavelength of the lowest vibration mode the same as the length of the string or tube?
(a) A string.
(b) An open tube.
(c) A tube closed at one end.
(d) All of the above.
(e) None of the above.
Question: Manufacturers typically offer a particular guitar string in a choice of diameters so that players can tune their instruments with a preferred string tension. For example, a nylon high-E string is available in a low- and high-tension model with diameter 0.699 mm and 0.724 mm, respectively. Assuming the density \(\rho \) of nylon is the same for each model, compare (as a ratio) the tension in a tuned high-and-low tension string.
A fish finder uses a sonar device that sends 20,000 Hz sound pulses downward from the bottom of the boat, and then detects echoes. If the maximum depth for which it is designed to work is 85 m, what is the minimum time between pulses (in fresh water)?
An airplane travels at Mach 2.1 where the speed of sound is 310 m/s. (a) What is the angle the shock wave makes with the direction of the airplane’s motion? (b) If the plane is flying at a height of 6500 m, how long after it is directly overhead will a person on the ground hear the shock wave?
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