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Lecture 8

# Resonance 2012 andrei sirenko njit 16 sound sound

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Unformatted text preview: VES: 2012 Andrei Sirenko, NJIT 17 TRAVELLING SOUND WAVES: A sound wave, traveling through a long air-filled tube with airspeed v, consists of a moving, periodic pattern of expansions and compressions of the air. 2012 Andrei Sirenko, NJIT 18 TRAVELLING TRAVELLING SOUND WAVES: 2012 Andrei Sirenko, NJIT 19 INTERFERENCE of the SOUND WAVES: INTENSITY of the SOUND WAVES: 2012 Andrei Sirenko, NJIT 20 The The Decibel Scale: 2012 Andrei Sirenko, NJIT The Doppler Effect For speeds 21 v less than the speed the speed of sound When the motion of detector or source is toward the other, the sign on its speed must give an upward shift in other the frequency. frequency. When the motion of detector or source is away from the other, the sign on its speed must give a downward shift in frequency 2012 Andrei Sirenko, NJIT 22 Supersonic Supersonic Speeds; Shock Waves 2012 Andrei Sirenko, NJIT 23 WAVES: QZ2 The figure is composite of three snapshots each of The figure is a composite of three snapshots, each of a wave wave traveling along a particular string. The phases for the waves are given by (a) (a) 2x - 4t, (b) 4x - 8t, and (c) (c) 8x - 16t. Which phase corresponds to which wave in the figure? Which phase corresponds to which wave in the figure? 2012 Andrei Sirenko, NJIT 24 Summary Summary 2012 Andrei Sirenko, NJIT 25 Summary 2012 Andrei Sirenko, NJIT 26 Summary Summary 2012 Andrei Sirenko, NJIT 27 Summary 2012 Andrei Sirenko, NJIT 28 Summary Summary 2012 Andrei Sirenko, NJIT 29 Andrei Sirenko, NJIT 30 Summary 2012 Summary Summary 2012 Andrei Sirenko, NJIT 31 Andrei Sirenko, NJIT 32 Summary 2012...
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