Passage IV
As sound waves travel through seawater, some of their energy is absorbed by the seawater. This sound absorptiondepends on several factors, including the pH of the water, the depth below the water's surface at which the sound waves travel, the frequency of the sound waves, the water temperature, and the water's salinity (concentration of dissolved salts in the water). Figures 1, 2, and 3 show一under the given conditions, respectively一how sound absorption (in decibels per kilometer, dB/km) varies with frequency (in kilohertz, kHz), temperature (in °C), and salinity (in parts per thousand, ppt; 1 ppt = 1 g/kg).
Figures adapted from Michael A. Ainslie and James G. McColm, "A Simplified Formula for Viscous and Chemical Absorption in Sea Water." @ 1998 by Acoustical Society of America.
26. Consider in Figure 1 how sound absorption changes as the frequency of the sound waves increases. As the wavelength (NOT frequency) of the sound waves increases, does sound absorption increase or decrease?
Your Answer is
Correct Answer is J
Explanation
General knowledge questions.
First of all, it needs to be clear that the larger the wavelength, the smaller the frequency.
According to Figure 1, when the frequency decreases, the sound absorption also decreases.