M1_sol - 5.0 m from a speaker emitting a tone at 550 Hz You...

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q,,30 5ou qTLoN Physics 133, 9:30 section, Midterm Exam #1, October 12"2010 Name: Recitation Instructor: Albert g Dainton patton schmidt Smith zizka Problem 3, 15 points. A 850 Hz sound wave enters a tube as shown to the right. The [email protected] arffiected to a circular section of radius r. Find the smallest two values of r for which the sound intensitv at the exit is a Page Score 345 n/s minimum. ('i) \$lh dil/r,.ra,w AL = ty - ry = rtr (, ("j) (4) i&^ firdot ' | 7 Jfvc/mi,rill.a, =ltq(n-i) z l\ (n+ i) '/ f):0 + r;= Vt4 ?'11 | = 1 + n = 3vsql{ - -r I zff--

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Unformatted text preview: 5.0 m from a speaker emitting a tone at 550 Hz. You then move to a point 35 m from the speaker. Assume the speaker can be modeled as an isotropic point source. What is the change in sound level' AB? rr 7 5,0'r< rrL : 35 n r) <r- t -LL qt(t _ T,.T _ | I1fr,L I: At' Vsou^{ T-=>q ^L T-,'. . ^\ .j' \ tr= -L / . t i \ r I It-t ll ' ?f \ / t t \ /i i ;-.,--\ @ r= L i_ ^p=h-f, "TT r-t (n+1) ,l'[f rL-5f" (+f (?,) (4) 7 zo"lu,,&:) = page 2 nrl*rrrrr, ;rr rrr#6,1 oul nc ss , : zo lrg,, /-:- \ t ^ ) l ! I I I I 0, o 612' 0,1,[e m...
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M1_sol - 5.0 m from a speaker emitting a tone at 550 Hz You...

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