Question

QUESTION 1 A 200-m-long aluminum rail is struck by a hammer at one end. How long will it take the resulting sound wave to reach the other end? Aluminum has a density of 2700 kg/m^3 and a Young's modulus of 70 GPa o a. 39 ms ob. 25 s O C. 5090 s o d. 1.02x10^6 s QUESTION 2 What will the wavelength of a 1000 Hz wave be in aluminum? Aluminum has a density of 2700 kg/m^3 and a Young's modulus of 70 GPa. o a. 5.1x10 6 m b.5.1 m C. 5100 m o d.0.2 m QUESTION 3 Yo get Oll of then What is the intensity in W/m 2 of an 80 dB sound? o a. 8X10A-11 W/m 2 o b. 8 W/m 2 C. 10 8 W/m^2 o d. 10A-4 W/m^2 QUESTION 4 By what factor is an 80 dB sound louder than a 40 dB sound. Remember that the decibel scale is logarithmic. 1 o a. 0.5 ob.2 cOmect C. 10,000 o d. 10 6 (Make they SnR aRL2

Answer 1

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I density So 2700 kq/m3 Young's modulus Y= 70484 From sped way 708109 2200 = 10.0259x109 = 1 25.9x106 25.09 x 103 mfs. as, vad, time to do trone taken to reach the other and of the rod = 200 5.091103 E 39.29x10's 239 ms. 2. Aven fa 1000 H2, S = 2700 kg/m3 Y= 70ela as x-fa speed frequency ware longth warelongth ar speed frequong - 5.098 103 1000 = 5-01 M2019-11-13 12:05 = 5.1m.