midterm2keyFall04C

midterm2keyFall04C - Name _ STUDENT ID Number 2nd MIDTERM...

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Page 1 of 7 Name ____________________________________________________ STUDENT ID Number 2nd MIDTERM EXAM KEY BIEB 166, Animal Behavior & Communication Fall Quarter, 2004 This exam should consist of 7 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. In all multiple choice and true false questions, we will grade you based upon the choice that you circle, not on any other information that you may have written. The exam has a total of 112 points; allot time to each question based upon its point value, and budget your time carefully. You have 1 hour, so you should budget your time accordingly. PLEASE USE A PEN when writing on the exam . ONLY EXAMS WRITTEN IN PEN CAN BE SUBMITTED FOR REGRADE REQUESTS! Please also note that the exam can be completely regarded when a regrade request is submitted such that extra points mistakenly given can also be taken away. IMPORTANT!!! This is a closed book, closed-note exam with NO CALCULATORS ALLOWED. When you turn in your exam, you must sign off next to your name on the master list to show that you attended the exam.
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Please initial here: ______________ Page 2 of 7 Total points on this page________ Good luck! (18 pts) True or False. Each statement is either true or false. Selecting both true and false is incorrect (2 pts each). 1) T F Sampling sound at the Nyquist frequency will enable you to compensate for sound sampling errors. 2) T F The speed of sound is greater in air than it is through water. 3) T F Echoes can affect the perceived pattern of amplitude modulation of a signal. 4) T F In general, fish communicate at higher frequencies than birds. 5) T F Boundary waves generally only carry low frequency sounds. 6) T F The SOFAR channel can allow signals to propagate over hundreds of kilometers. 7) T F Global attenuation involves the progressive attenuation of high frequencies to a greater extent than lower frequencies. 8) T F Frequency multipliers allow insects to produce higher frequencies and louder sounds. 9) T F Shadow zones are created in aquatic environments because sound prefers to propagate in a region of high sound velocity. 10) (4 pts) Briefly define the time-frequency uncertainty principle for Fourier analysis. The time-frequency uncertainty principle states that in any given Fourier analysis, you can either know the frequency very precisely or how the signal changes in time very precisely, but you cannot know both attributes precisely. Thus there is always a tradeoff. For example, if you know how the signal changes with time very precisely, you will only have a poor idea of the exact signal frequency.
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midterm2keyFall04C - Name _ STUDENT ID Number 2nd MIDTERM...

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