Question

When an emperor penguin returns from a search for food, how can it find its mate among the thousands of penguins huddled together for warmth in the harsh Antarctic weather? It is not by sight, because penguins all look alike, even to a penguin! The answer lies in the way penguins vocalize. Most birds vocalize by using only one side of their two-sided vocal organ, called the syrinx. Emperor penguins, however, vocalize by using both sides simultaneously. Each side sets up acoustic standing waves in the bird's throat and mouth, much like in a pipe with two open ends. Suppose that the frequency of the first harmonic produced by side A is fai = 432 Hz and the frequency of the first harmonic produced by side B is foi = 371 Hz. What is the frequency between those two first-harmonic frequencies and between the two second-harmonic frequencies? Follow the steps below to get to the answer. (i) First find the beat frequency between the two given frequencies. In this case, you need only the lower value of the beat frequency (i.e. the subtracted one). (ii) Find the second harmonic for side A. (iii) Find second harmonic for side B. (iv) Finally find the beat frequency between the two second harmonics found in parts (ii) and (iii). (v) Make a comment about your answer to (iv). How are the sounds made my penguins different from those made by humans?

Answer 1

Answer

A 432 - 371 12:3:..... Grey fal = 432 Hz fol=371H2. 1 Beat frequency fair fol 11) In an open pope, harmonics are in the salis Second harmonic FAI= 2x432 = 864 Hz. 11) dorside B, second harmonis, - 2x foi= 2 x 371 " Beat Frequency of second hassnowie 864 742 = 122 Hz, 2x 742 H 2. I Just like harmonics are in the ratio 1:12:3.. the beat frequencies are also in the ratio 1:2:3.... New researches suggest, Pengain vocal patterns follow the same principles as humas linguistes. (Science focus). The difference is that, the words used by Penguins are shostest, while the longest woods made up of shosten syllables. Longer the syllable less frequently it is being used. /