Phy 7C Spring 2010 Quiz 2 Solution

Phy 7C Spring 2010 Quiz 2 Solution - Two speakers(speakers...

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Unformatted text preview: Two speakers (speakers A and B) are connected to a single function generator so that they both produce sound waves in air with a frequency of 170 Hz. You place speaker A to your left and speaker B to your right, so that you are standing exactly 5 meters away from each of them. You notice that even though both speakers are turned on, you hear no sound. a) What can you conclude about the relationship between the fixed phase constants of speakers A and B? Explain clearly. 5 in <2 you are '5 M away fr 9m ea 914 5 l? e a kev‘ " = - o 1' he, 9 ii no fawn-i . We knuw Thq'i‘ XA 'XB -— AX ¢Dx Al) / face 1- 1' [fine a Mufi” D2 dlevac’i‘V've ini’frffi’c“:/ gig Ti- (°" ‘Vm’e 011‘?’ y. ., l 94A MM’i—I’fle Off 73'), {imce ”F 11‘? A ’F and We njji' Way we, Cm 3““ Aggfi- I; To Lave [3/5 Q/A'fiD/a: b) You now start walking toWards speaker B. How far do you have to walk from your original position until you first come to a location where the sound is maximally loud? Explain and show your work. To V w/VLCL : if» Hike,“ firs’)” rain"? ” 0 "\‘l: ‘(omshausfi‘jvel ;,‘F)~€,-Fepgq¢fl We neeoi ’i‘o fie”? ASS; 51-“ up A353 2.7T wa/ since we. ' .. 0 So are Wand") +owordf ‘ B/ we know Tad}? XA KB > / ' 1. _ £3, ' ‘we [arrow fhaj we -“L’LI;(XA-33)<0/ {a w”? --A)X W, a I " (’e. ' +7“? ,Efbkm'i‘ll‘un ? 4 3n, Fxmx Agape, TAM y La: \ A a ‘ _ 3 c ’ (EEDMQWJ—ffi / [A 8A ' :‘ o /" ,n _ ‘ ‘6 <1 €“’ \7" H? mm» Van“ >K’i "y/ we ”it 1.44 5mg A I m I'lwwevtr/ éLS you qu I: J M as“ >01 "*8 ... ' , , \cr 4 b l i are 9‘le Waikiki? “W47 0% , tawer” B/ 3“ fabuurcjf 13. ’22:] V") yeu' MMST“ Wei”? .‘C M 5f4r’r- (/015th ® _ 'ixe Mi/ . ...
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