# prob08 - 1 Problem Set 08 P ROBLEM S ET 8 G ENERAL S CIENCE...

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Instructions Complete the following exercises in class on Thursday, May 26. Feel free to work together in groups or to consult with your instructor. These exercises are for your bene±t and need not be turned in. Make sure you understand all of the material! 1. Explain why an orchestra conductor must bring out more bass tones to his hearing to have the audience properly hear the music. 2. A single mosquito produces a noise of 44 dB. How many mosquitos would be necessary to produce a noise of 84 dB? 3. I blow a note on a trumpet that registers 88 dB. If I play it twice as loud, what is the new dB measure? 4. Suppose instead I play it sixteen times as loud, what is the new dB measure? 5. I measure a sound in the distance with my dB meter to be 84 dB. I now double my distance from the source. What is the new reading? 6. I quadruple my distance from the source. What now is the reading? Summer 2010

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Unformatted text preview: 1 Problem Set 08 P ROBLEM S ET 8 G ENERAL S CIENCE 121 S UMMER 2011 7. Match the sound stimulus to a humans perception: Amplitude Timbre Frequency Pitch W a v e S h a p e L o u d n e s s 8. What percent change is necessary in loudness before humans can perceive it? What percentage of frequency difference is necessary before humans perceive it? 9. On a foggy night you hear a ship horn with a pitch of 450 Hz. The horn normally has a pitch of 440 Hz. Should you worry? Calculate the ships speed if the temperature is 20 C. Note: You must convert the frequencies to wavelengths using the sound speed you calculate. 10. Compute the speed of the ship in the previous example if it is instead 10 C. 11. A car has a horn that produces a pitch of 300 hz. On a 20 C day, the car is speeding away from you at 35 m/s. What pitch would you hear the horn? Summer 2011 2 Problem Set 08...
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## This note was uploaded on 06/02/2011 for the course GSCI 121 taught by Professor Niculescu,m during the Spring '08 term at James Madison University.

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prob08 - 1 Problem Set 08 P ROBLEM S ET 8 G ENERAL S CIENCE...

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