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Physics II Lab w answers_Part_9

Physics II Lab w answers_Part_9 - Experiment 5 Velocity of...

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29 Experiment 5 Velocity of sound Apparatus: Audio frequency generator, speaker, microphone, Cathode Ray Oscilloscope (CRO), meter scale, large board (or wall), Thermometer (0-100 0 C) Purpose of experiment: i) To determine the Velocity of Sound ii) To understand the operation of a CRO Basic methodology: Sound waves produced by an audio frequency generator are made to reflect off a large reflecting board forming standing waves. A microphone connected to a CRO serves to measure the amplitude of the sound. The wavelength of sound waves is obtained from the positions of the nodes. I. Introduction: I.1. Standing waves are produced when two progressive sinusoidal waves of the same amplitude and wavelength interfere with each other. Consider two traveling waves traveling along the positive and negative x directions respectively ) t kx ( sin A ) t , x ( y 1 ω - = ------------------------- (1) ) t kx ( sin A ) t , x ( y 2 ω + = ------------------------- (2) where A is the amplitude of the waves, k = 2 ° ± is the wave number and ² = 2 ° f is the angular frequency. The quantity y(x,t) is the displacement of the medium at
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