MidtermTwo2007keyD

MidtermTwo2007keyD - Latest revision: 5/17/07, 9:34 AM Name...

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Latest revision: 5/17/07, 9:34 AM Name STUDENT ID Number 2ND MIDTERM EXAM KEY VERSION D BIEB 166, Animal Behavior & Communication Spring Quarter, 2007 This exam should consist of 8 pages (including this top page); please check that your exam is complete. Sign your initials in the space provided on each page . Please write your answers only in the spaces provided on each page. You may use the back of the pages as a “scratch sheet”, but we will not grade anything written on the back of the page. The exam has a total of 96 points; allot time to each question based upon its point value, and budget your time carefully. (You might want to leave a little time at the end for checking over your answers). The exam will end at 11:50 AM. Good luck!
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BIEB 166: Animal Communication & Behavior Initials:____________________________ Page 2 of 9 total student points on this page:______ IMPORTANT! For multiple choice questions, there is only one correct or best answer per question. Circling more than one answer per question is incorrect. 1) (4pts) Which of the following statements is correct ? (a) The SOFAR channel allows sounds to carry over great distances, in part, because sound waves propagate best through a zone of low sound velocities. (b) Animals living in open environments that are not subject to echoes tend to produce more slowly amplitude modulated signals than animals that live in dense environments that are subject to echoes. (c) When we speak of signal pattern loss, we refer only to how the amplitude modulation of a signal is affected. (d) Echoes are an example of a time domain source of signal amplification. (e) In sound shadow zones, sound reverberates and is thus distorted. 2) (4pts) As discussed in lecture, which of the following statements about Fourier analysis is incorrect ? (a) The Fourier spectrum of a signal is a graphical representation of the frequencies in the signal and their relative amplitudes. (b) Through Fourier analysis, any sound can be broken down into a series of component frequencies. (c) The more a signal deviates from a single frequency sine wave, the more sine wave components must be added together to recreate the signal. (d) The time-frequency uncertainty principle states that the frequency uncertainty increases as the signal gets longer. (e) The Fourier phase spectrum of a signal shows how the phases of the different frequencies in the signal are shifted relative to each other. 3) (4pts) Based upon what we learned in lecture, which of the following is incorrect ? (a) In general, near-field sound amplitude equals sound pressure amplitude at one wavelength from the sound source. (b) In aquatic environments, sounds produced near the surface tend to propagate poorly. (c) The cocktail party effect refers to the ability of animals to recognize individual
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MidtermTwo2007keyD - Latest revision: 5/17/07, 9:34 AM Name...

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