(7%) Problem 9: Elephants can create and distinguish infrasonic sounds — sounds with frequencies lower than about 20 Hz

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7 Problem 9 Elephants Can Create And Distinguish Infrasonic Sounds Sounds With Frequencies Lower Than About 20 Hz 1 (143.77 KiB) Viewed 65 times

(7%) Problem 9: Elephants can create and distinguish infrasonic sounds — sounds with 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 4.89 meters that is closed at the larynx and open at the tip of the trunk. Elephant Trunk Modeled as Cylindrical Air Column Larynx (Closed End) Trunk tip (Open End) Otheexpertta.com 33% Part (a) Choose the image that shows the standing wave associated with the displacement of air molecules for the first fundamental frequency fi produced in the air column. (closed end) (open end) ✓ Correct! *33% Part (b) 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 339 m/s. fi = 1657 X Attempts Remain DA 33% Part (C) With the same speed of sound as in part (b), 339 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 5.1 Hz? (You might consider the likeliness of the occurrence of such a frequency in nature.) Grade Summary L= m Deductions 0%