Elephants can create and detect infrasonic sounds—sounds of frequencies lower than about 20 Hz—which can travel long distances. They create these sounds using the cavity that extends from their larynx to the tip of their long trunk. Consider this cavity as a cylindrical air column, of length 4.65 m, that is closed at the larynx and open at the tip of the trunk. Calculate the fundamental frequency of a standing wave in such an elephant’s air column, in hertz. Take the speed of sound in air to be 340 m/s. With the same speed of sound as in the first question, 340 m/s, how long, in meters, would an elephant’s air column have to be to maintain a standing wave at a fundamental frequency of 7.6 Hz? (You might consider the likeliness of the occurrence of such a frequency in nature.)
Elephants can create and detect infrasonic sounds—sounds of frequencies lower than about 20 Hz—which can travel long distances. They create these sounds using the cavity that extends from their larynx to the tip of their long trunk. Consider this cavity as a cylindrical air column, of length 4.65 m, that is closed at the larynx and open at the tip of the trunk. Calculate the fundamental frequency of a standing wave in such an elephant’s air column, in hertz. Take the speed of sound in air to be 340 m/s. With the same speed of sound as in the first question, 340 m/s, how long, in meters, would an elephant’s air column have to be to maintain a standing wave at a fundamental frequency of 7.6 Hz? (You might consider the likeliness of the occurrence of such a frequency in nature.)
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Elephants can create and detect infrasonic sounds—sounds of frequencies lower than about 20 Hz—which can travel long distances. They create these sounds using the cavity that extends from their larynx to the tip of their long trunk. Consider this cavity as a cylindrical air column, of length 4.65 m, that is closed at the larynx and open at the tip of the trunk.
| Calculate the fundamental frequency of a standing wave in such an elephant’s air column, in hertz. Take the speed of sound in air to be 340 m/s. |
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With the same speed of sound as in the first question, 340 m/s, how long, in meters, would an elephant’s air column have to be to maintain a standing wave at a fundamental frequency of 7.6 Hz? (You might consider the likeliness of the occurrence of such a frequency in nature.) |
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