Quiz2_Solution

Quiz2_Solution - Quiz 2. Monday, February 9‘“, 2009 PHY...

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Unformatted text preview: Quiz 2. Monday, February 9‘“, 2009 PHY 252 SOLUTION Name: 1. The fundamental frequency of a pipe that is open to air at both ends is 1032 Hz. The speed of sound in air is 344 m/s. a. How long is the pipe? (2 points) "U 2&0“. J 50 7L 2" SE . (1E0 : Open~plpe freiueucj) For-o- Pepe open a} bath emu. 9L = 37’- , out 14:: :fflthzi-Wal 5'9 7-50 (anon 1/1) _' M b. If the pipe is now closed at one end, what is the new fundamental frequency? (2 points) Uri-la meal closeup, now '2 = 3;)“. , owl M=t farflefmdamdd. M. ‘ :-— v -- = v -— 4.1. r.- J- " 1"1' g: ‘9 ‘5‘: ['1' ”‘ 2(1L) 2590 cg; = {-XIOBZ #2,: 516 H; 7V 2. On the diagrams below draw sinusoidal/cosinusoidal curves indicating how the air displacement, air pressure, and air density vary as a function of position for the first overtone. in a pipe that is open at both ends. (3 points) ll "Tim. is}: over-tong ._ Second. Idem-monch 14:2 raj—~24.- —_-_ L 2. Antinodes at the open ends. 7700 nodes Displacement 2-, 3')!- Pressure l0 at — J 8 .3". Pressure 1“ Z(x,t) = Hmflkix “W;i) ‘1‘ Pl 6°5CK|DC +wi'i'.) _-—_- A, 44313.1:(3: - + A" mlE—(m-ri‘)] : 2,4 m (age) 605(flk) STAUflMM— wAuE L- 143 oft‘uwe mm to Quiz 2. Monday, February 9'1‘, 2009 PHY 252 3. Consider a bird’s voice as an idealized point source, emitting constant sound power, with the intensity varying proportionally to the square of the inverse distance from the bird. Point source :' WW: WVt-mir. mm“ H Nam)“ m k; -'-).\u-.ru"fism By how many decibels does the sound level drop when you move twice as far away from the bird? (ie from P1 to P2) (2 points) SM '1 :faJJA DH 0-5 PH‘le Inverse slum-e Ofdtstaucefi Tfid‘gwfl Power“ = “Tali. = Lr‘fl'fi‘I: 7. , ‘_ "I; _ l'} ':I:l r37- Tke. Sou-AA are decibels) -l2 B. = Iofiawtit) «4 as Wadi? were W- pz—(s. = Waw(%)*'“°5w(%) :1. 10%",[éj—3 (PCCan (ijw’oilj :Ioj ...
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Quiz2_Solution - Quiz 2. Monday, February 9‘“, 2009 PHY...

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