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Unformatted text preview: practice 14 ALIBHAI, ZAHID 1 Latest unpenalized work: Apr 29 2007 Sunday 04:00 (after this date you can not make a perfect score). Work cutoff: Apr 29 2007, 4:00 am. Question 1 part 1 of 2 10 points An ambulance is traveling east at 58 . 8 m / s . Behind it there is a car traveling along the same direction at 33 . 1 m / s . The ambulance driver hears his siren with a wavelength of . 42 m . 33 . 1 m / s Car 58 . 8 m / s Ambulance What is the measured wavelength of the sound of the ambulances siren when you are holding your measuring device behind the ambulance? The velocity of sound in air is 343 m / s . Answer in units of m. Question 2 part 2 of 2 10 points What is the measured wavelength of the sound of the ambulances siren when your measuring device is on the cars hood? Answer in units of m. Question 3 part 1 of 2 10 points In order to be able to determine her speed, a skydiver carries a tone generator. A friend on the ground at the landing site has equip ment for receiving and analyzing sound waves. While the skydiver is falling at terminal speed, her tone generator emits a steady tone of 1250 Hz. Assume the air is calm and that the sound speed is 343 m / s, independent of altitude. If her friend on the ground (directly be neath the skydiver) receives waves of fre quency 2390 Hz, what is the skydivers speed of descent? Answer in units of m / s. Question 4 part 2 of 2 10 points If the skydiver were also carrying sound receiving equipment sensitive enough to de tect waves reflected from the ground, what frequency would she receive? Answer in units of Hz. Question 5 part 1 of 3 10 points Three successive resonance frequencies in an organ pipe are 5370 Hz, 6086 Hz, and 6802 Hz. Is the pipe closed at one end or open at both ends, and why? 1. There are both odd and even harmonics, so the pipe must be fixed at both end. 2. There are no odd harmonics, so the pipe must be fixed at one end only. 3. There are no even harmonics, so the pipe must be fixed at one end only. 4. There are no even harmonics, so the pipe must be fixed at both end. 5. There are no odd harmonics, so the pipe must be fixed at both one end. 6. There are both odd and even harmonics, so the pipe must be fixed at one end only. Question 6 part 2 of 3 10 points What is the fundamental frequency? Answer in units of Hz. Question 7 part 3 of 3 10 points What is the length of the pipe? Answer in units of cm. practice 14 ALIBHAI, ZAHID 2 Question 8 part 1 of 2 10 points The figure below represents a sound wave in a hollow pipe with both ends open. Determine the wavelength of the sound wave in this hollow pipe. 1. = 4 2. = 3. = 2 4. = 2 5 5. = 2 3 6. = 3 7. = 2 8. = 2 9 9. = 2 7 Question 9 part 2 of 2 10 points Consider another organ pipe which has one end open and one end closed....
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 Spring '08
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