Chapter 12: 2Q (page 328)
What is the evidence that sound is a form of energy?
Following are the point which shows that sound is in the form of energy.
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A guitar player shortens the length of a guitar’s vibrating string by pressing the string straight down onto a fret. The guitar then emits a higher-pitched note because
(a) the string’s tension has been dramatically increased.
(b) the string can vibrate with a much larger amplitude.
(c) the string vibrates at a higher frequency.
On a warm summer day \(\left( {31^\circ {\rm{C}}} \right)\), it takes 4.80 s for an echo to return from a cliff across a lake. On a winter day, it takes 5.20 s. What is the temperature on the winter day?
Question: (II) Estimate the frequency of the “sound of the ocean” when you put your ear very near a 15-cm-diameter seashell (Fig. 12–35).
When a sound wave passes from air into water, do you expect the frequency or wavelength to change?
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.
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