MidtermTwo2007keyC

MidtermTwo2007keyC - Latest revision: 5/17/07, 9:32 AM Name...

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Latest revision: 5/17/07, 9:32 AM Name STUDENT ID Number 2ND MIDTERM EXAM KEY VERSION C 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) In lecture, we learned about many types of animal ears. With regards to these different types of ears, which of the following statements is incorrect ? (a) Fly antennal aristae are sensitive to the pressure component of sound. (b) Insects can use mechanosensory hairs to detect particle-velocity sounds and vibrations. (c) There are two basic kinds of pressure detector ears. (d) A particle-velocity ear is sensitive to near-field sound. (e) Small animals sometimes use pressure difference detector ears in order to increase their ability to determine the direction that sounds are coming from. 2) (4pts) As discussed in lecture, which of the following statements about sound is incorrect ? (a) In the near-field, there is a net displacement of particles. (b) The free field is an idealized sound field in which there are no echoes and in which sound spreads spherically. (c) In the far-field, there is no net displacement of particles. (d) In general, the particle velocity component of sound carries for greater distances than the pressure component of sound. (e) In general, infrasound travels over greater distances than ultrasound if both sound types are produced at the source with the same amount of energy. 3) (4pts) As discussed in lecture, which of the following statements about acoustic impedance is incorrect ? (a) Acoustic impedance plays an important role in determining how sound reflects. (b) The acoustic impedance of water is greater than the acoustic impedance of air. (c) Acoustic impedance is the resistance of a medium to transmitting sound. (d) When sound passes from one medium to another, the reflection coefficient is directly proportional to the ratio of acoustic impedances of the two mediums. (e) The acoustic impedance of a given medium is inversely proportional to the speed
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MidtermTwo2007keyC - Latest revision: 5/17/07, 9:32 AM Name...

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