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Unformatted text preview: uency and the 20-kHz second harmonic. The student measures the wave at 1 m and at 1 km from the source. At each of these two distances, is the student likely to detect distortion of the wave in the form of a second harmonic signal that is significant compared to that of the fundamental? Justify your answer. E3. A plane sound wave propagating parallel to the ground has a waveform with one pronounced pressure peak. There are three microphones. In Cartesian coordinates (x, y), microphone 1 is at (0, 0), microphone 2 is at (1 m, 0), and microphone 3 is at (0, 1 m). North is in the direction of the positive y axis. (a) A sound wave is propagating from southwest to northeast and the gas medium is hydrogen (at 0C). If microphone 1 receives the pressure peak at t 1 = 0 (a reference time), then what are the times ( t 2 and t 3 ) that microphones 2 and 3 receive the pressure peak. (b) Now the medium is unknown. Microphone 1 receives the peak pressure at time t 1 = 0 , microphone 2 at time t 2 = 2.25 ms , and microphone 3 at time t 3 = 1.47 ms . What is the speed of the wave, and in what is the wavef...
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- Fall '08