Question

Problem 1: A sound wave of the form s = Smax cos(kx - wt+ 0) travels at 343 m/s through air in a long horizontal tube. At one instant, air molecule A at x = 2.000 m is at its maximum positive displacement of 6.00 nm and air molecule B at x = 2.070 m is at a positive displacement of 2.00 nm. All the molecules between A and B are at intermediate displacements. (a) What is the wavelength of the wave? (b) What is the frequency of the wave? (c) If the density of air is p = 1.21 kg/m, what is the bulk modulus of air? (d) What is the maximum change of pressure Apmax?! (e) What is the intensity and the sound level of the wave propagating in the tube

Answer 1

question by the According to the aboie given talning solution as da li oon is Chest and a= 2.oto is tough 21- (2.070) -2.000) ! =) 0.070 m y = 0.070 m Frequency of ice wave? ! ta! 37-343 0lv 1450 Hz Scanned with CamScanner

to the density of Firp - 1.21 kg/m3 we need to tad out the bulk modules of 491 : B = n2 = 1.218 (3433 = 1218 117,665 . 142.355 pa = 142 xoops Ape = upne Sack ne = 294 = 2x24521 = 49001 and's there all o olhar clasplacement are nese wc exticame klues to these are the displacemsit, at Crest and bagh. Respectively . Smax = 6-2 - = 4 :29% => 21101m Scanned with CamScanner

Aporx: 34211-21 x 4900 1 x 2 x 109 = 10 28x102pg Am! I eng rom * pur 1 Intensity of the wille given up : =). 27 x (2410) x (2 4107)x 121x343 = 1.9671 167 0/22 Send level = loloy (14) where I = 102 w/n => bolag (1 767 xa ?) => rafby (1.267 233) -> 10 [64 bog 19647 a) 52.94 dB =) (57.14 de CS scal Scanned with CamScanner