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Chapter 17: Q7PE (page 629)
Dolphins make sounds in air and water. What is the ratio of the wavelength of a sound in air to its wavelength in seawater? Assume air temperature is .
The ratio is 0.22
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Six members of a synchronized swim team wear earplugs to protect themselves against water pressure at depths, but they can still hear the music
and perform the combinations in the water perfectly. One day, they were asked to leave the pool so the dive team could practice a few dives, and they tried to practice on a mat but seemed to have a lot more difficulty. Why might this be?
How does an unamplified guitar produce sounds so much more intense than those of a plucked string held taut by a simple stick?
a) What is the speed of sound in a medium where a 100 kHz frequency produces a 5.96 cm wavelength? (b) Which substance in Table 17.1 is this likely to be?
Elephants and whales are known to use infrasound to communicate over very large distances. What are the advantages of infrasound for long distance communication?
It is more difficult to obtain a high-resolution ultrasound image in the abdominal region of someone who is overweight than for someone who has a slight build. Explain why this statement is accurate.
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