Copyright 2010 by Pearson Education 1 Assignment 11: Critters reading: HW11 assignment spec.
i.e.webphysics.iupui.edu/218/218HW/HW11.pdfSuppose the frequency of a note on an organ is 17 Hz. ......
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1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Intensity of a Speaker 001 10.0 points An experiment requires sound intensity 0.709 W/m 2 at the distance of 2.09 m in any direction from a speaker. What total sound power is required? Noise Level of Rock Concert 002 10.0 points A point source emits sound waves with a power output of 130 W. At what distance will the decibel reading be 120 dB, which is noise level of a loud indoor rock concert? Serway CP 14 19 003 10.0 points Calculate the difference β 2 - β 1 in decibel levels of a sound source if the respective dis- tances from the source to the receivers are r 1 = 68 m, and r 2 = 117 m. Correct answer: -4.71354 dB. Standing Waves 23 004 (part 1 of 2) 10.0 points The length of a hollow pipe is 470 cm. The air column in the pipe is vibrating and has five nodes. Find the frequency of the sound wave in the pipe. The speed of sound in air is 343 m/s. 005 (part 2 of 2) 10.0 points What is the fundamental frequency; i.e., the lowest frequency the pipe can sustain? Lowest Note of an Organ 006 (part 1 of 2) 10.0 points Suppose the frequency of a note on an organ is 17 Hz. What is the shortest organ pipe with both ends open that will resonate at this frequency? The velocity of sound in air is 343 m/s. 007 (part 2 of 2) 10.0 points What would be the lowest resonating fre- quency of the same organ pipe if we close one end and leave the other end open? Serway CP 14 69 008 10.0 points Two ships are moving along a line due east. The trailing vessel has a speed of 49 km/h relative to a land-based observation point, and the leading ship has a speed of 40.9 km/h relative to the same station. The trailing ship transmits a sonar signal at a frequency of 960 Hz. What frequency is monitored by the leading ship? Use 1710 m/s as the speed of sound in ocean water. Correct answer: 961.273 Hz. Bat After Its Prey 009 10.0 points A bat moving at 4.6m/s is chasing a flying insect. The bat emits a 43 kHz chirp and receives back an echo at 43.63 kHz. At what speed is the bat gaining on its prey? Take the speed of sound in air to be 337 m/s. Correct answer: 2.45055 m/s.
Transcript of i.e.webphysics.iupui.edu/218/218HW/HW11.pdfSuppose the frequency of a note on an organ is 17 Hz. ......
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This print-out should have 9 questions.Multiple-choice questions may continue onthe next column or page – find all choicesbefore answering.
Intensity of a Speaker001 10.0 points
An experiment requires sound intensity0.709 W/m2 at the distance of 2.09 m in anydirection from a speaker.What total sound power is required?
Noise Level of Rock Concert002 10.0 points
A point source emits sound waves with apower output of 130 W.At what distance will the decibel reading be
120 dB, which is noise level of a loud indoorrock concert?
Serway CP 14 19003 10.0 points
Calculate the di!erence !2 ! !1 in decibellevels of a sound source if the respective dis-tances from the source to the receivers arer1 = 68 m, and r2 = 117 m.
Correct answer: !4.71354 dB.
Standing Waves 23004 (part 1 of 2) 10.0 points
The length of a hollow pipe is 470 cm. Theair column in the pipe is vibrating and hasfive nodes.
Find the frequency of the sound wave in thepipe. The speed of sound in air is 343 m/s.
005 (part 2 of 2) 10.0 pointsWhat is the fundamental frequency; i.e., the
lowest frequency the pipe can sustain?
Lowest Note of an Organ006 (part 1 of 2) 10.0 points
Suppose the frequency of a note on an organis 17 Hz.What is the shortest organ pipe with both
ends open that will resonate at this frequency?The velocity of sound in air is 343 m/s.
007 (part 2 of 2) 10.0 pointsWhat would be the lowest resonating fre-quency of the same organ pipe if we closeone end and leave the other end open?
Serway CP 14 69008 10.0 points
Two ships are moving along a line due east.The trailing vessel has a speed of 49 km/hrelative to a land-based observation point,and the leading ship has a speed of 40.9 km/hrelative to the same station. The trailingship transmits a sonar signal at a frequencyof 960 Hz.What frequency is monitored by the leading
ship? Use 1710 m/s as the speed of sound inocean water.
Correct answer: 961.273 Hz.
Bat After Its Prey009 10.0 points
A bat moving at 4.6 m/s is chasing a flyinginsect. The bat emits a 43 kHz chirp andreceives back an echo at 43.63 kHz.At what speed is the bat gaining on its
prey? Take the speed of sound in air to be337 m/s.
Correct answer: 2.45055 m/s.
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Sample HW11 - PHYS 21800
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