# Answer Key Chapter 17 - University Physics Volume 1 _ OpenStax (6).pdf

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8/7/2020Answer Key Chapter 17 - University Physics Volume 1 | OpenStax1/8Check Your Understanding17.1Sound and light both travel at definite speeds, and the speed of sound is slower than the speed oflight. The first shell is probably very close by, so the speed difference is not noticeable. The second shell isfarther away, so the light arrives at your eyes noticeably sooner than the sound wave arrives at your ears.17.210 dB: rustle of leaves; 50 dB: average office; 100 dB: noisy factory17.3Amplitude is directly proportional to the experience of loudness. As amplitude increases, loudnessincreases.17.4In the example, the two speakers were producing sound at a single frequency. Music has variousfrequencies and wavelengths.17.5Regular headphones only block sound waves with a physical barrier. Noise-canceling headphones usedestructive interference to reduce the loudness of outside sounds.17.6When the tube resonates at its natural frequency, the wave’s node is located at the closed end of thetube, and the antinode is located at the open end. The length of the tube is equal to one-fourth of thewavelength of this wave. Thus, if we know the wavelength of the wave, we can determine the length of thetube.17.7Compare their sizes. High-pitch instruments are generally smaller than low-pitch instruments becausethey generate a smaller wavelength.17.8An easy way to understand this event is to use a graph, as shown below. It appears that beats areproduced, but with a more complex pattern of interference.17.9If I am driving and I hear Doppler shift in an ambulance siren, I would be able to tell when it wasgetting closer and also if it has passed by. This would help me to know whether I needed to pull over andlet the ambulance through.

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