exam3soln

# exam3soln - 1 Physics 198 EXAM 3 December 3, 2009 The exam...

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1 1 Physics 198 EXAM 3 December 3, 2009 The exam is closed book, although you may use a single sheet of paper to help memory. (You may also use the two sheets from previous exams as well.) For multiple choice questions, mark the answer you believe is MOST CORRECT on the exam. All questions are worth points. Please turn in only the exam sheets. You can assume that the speed of sound in air is 343 m/s for this exam. ____________________________________________________________________ Consider the following characteristics of various scales: i. Perfect 4’ths and 5’ths throughout the scale ii. Perfect tonic, dominant, subdominant triads but only for one key without retuning. iii. Enharmonic notes (e.g., B#,C) have the same frequency iv. Perfectly closed circle of 5’ths 1. Which of the above are correct for a Pythagorean scale? a. i only b. ii only c. iii only d. iv only e. iii and iv 2. Which of the above are correct for a just-temperament scale? a. i only b. ii only c. iii only d. iv only e. iii and iv 3. Which of the above are correct for an equal-temperament scale? a. i only b. ii only c. iii only d. iv only e. iii and iv

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2 2 4. Suppose one constructs a 19-tone, microtonal scale. Nineteen equally spaced tones then span an octave. If there were a tone at 262 Hz, what is the frequency of the next higher tone. You need not calculate it explicitly, but give the correct mathematical expression for the frequency of the next note. We require that " 19 = 2 so that = 2 1 19 = 1.03726 and f = 262 " 2 1 19 = 262 " 1.03716 = 271.734 Hz. 5. Most of the sound that a listener hears from a violin is radiated into the air from the a. Nut b. Sound post c. Strings d. Bridge e. Top and back plates 6. An ideal violin (or guitar) string plucked exactly at the center location between the nut and the bridge has: a. only the first harmonic b. a particularly rich harmonic spectrum with both even and odd harmonics extending to high harmonic numbers. c. only even harmonics. d. only odd harmonics . e. has harmonics 1,2,3,4; harmonics 5 and higher are missing. 7. When Aaron demonstrated bowing sul ponticello with his cello which type of sound spectrum was produced. a.
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## exam3soln - 1 Physics 198 EXAM 3 December 3, 2009 The exam...

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