(Solved): (7\%) Problem 9: Elephants can ereate and detect infrasonic sounds - sounds with frequencies lower ...

(7\%) Problem 9: Elephants can ereate and detect infrasonic sounds - sounds with frequencies lower than about \( 20 \mathrm{~Hz} \) - which can travel long distances. They create these sounds using the lower than about \( 20 \mathrm{~Hz} \) - which can travel long distances. They create these sounds using t cavity that extends from their laryn to the tip of their long trunk. Consider this cavity as a Cylindrical Air Column cylindrical air column of length \( 4.86 \) meters that is closed at the larynx and open at the tip of the trunk: Larynx (Closed End) Trunk tip (Open End Ethcexperttai,can - \( \otimes 33 \% \) Part (a) Choose the image that shows the standing wave associated with the displacement of air molecules for the hirst fundamental frequency \( f \) produced in the air column. \( \sqrt{\text { Correct }} \) A 33\% Part (b) Calculate the fundamental frequency of a standing wave in such an elephant's air column, in hert. Take the speed of sound in air to be \( 354 \mathrm{~m} / \mathrm{5}- \) - A 33\% Part (c) With the same speed of sound as in part (b), \( 354 \mathrm{~m} / \) s, how long, in meters, would an elephant's air column have to be to maintain a standing wave at a fundamental frequency of \( 8.4 \mathrm{~Hz} \) (You might consider the likeliness of the occurrence of such a frequency in nature) \( L= \) GraifeSummary Deductions