Question

Problem 1. You're walking through the woods and come upon some railroad tracks. You walk southward beside the tracks at 1.00 m/s as you hear a train horn north of you emitting a sound at 650 Hz. Knowing from your previous experience with trains, the sound should be a 500 Hz tone. Take the speed of sound to be 340 m/s. a) How fast is the train moving relative to you? b) Further knowledge of a train whistle says that it should be a 50.0 W whistle. Knowing the dB scale, you estimate it to be a 70.0dB sound. How far is the train from you? c) Assuming the train is coming straight south, approximately how long do you have until the train reaches your position?

Answer 1

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(a) Sool 340-10)550 => Ü 2140.7m/s? Vr = 139.7m/5 70 = 10 log (1 ) I=105 halos >> R 3/ 50x10S & R = 6.31x13m R = 631m] (C) = R-631 Vr 139.7 alt= 4.51 sec 4ER2 ✓ 41