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May 8, 2024

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Review When two waves overlap, the displacement of the medium is the sum of the displacements of the two individual waves. This is the principle of _______ A. Constructive interference B. Destructive interference C. Standing waves D. Superposition A point on a standing wave that is always stationary is ______ A. Maximum B. Minimum C. Node D. Antinode You can decrease the frequency of a standing wave on a string by A. Making the string longer. B. Using a thicker string. C. Decreasing the tension. D. All of the above We describe sound waves in terms of pressure. Given this, for a standing wave in a tube open at each end, the open ends of the tube are A. Nodes. B. Antinodes. C. Neither nodes or antinodes. The interference of two sound waves of similar amplitude but slightly different frequencies produces a loud-soft-loud oscillation we call A. Constructive and destructive interference. B. The Doppler effect. C. Beats. D. Vibrato. Two wave pulses on a string approach each other at speeds of 1 m/s. How does the string look at t = 3 s?
Two waves on a string are moving toward each other. A picture at t = 0 s appears as follows: How does the string appear at t = 2 s? What is the wavelength of this standing wave? C. 1.0 m What is the mode number of this standing wave? B. 5 Which of the following changes will increase the frequency of the lowest frequency standing sound wave on a stretched string? B. Increasing the tension in the string A standing wave on a string vibrates as shown. Suppose the string tension is reduced to 1/ 4 its original value while the frequency and length are kept unchanged. Which standing wave pattern is produced? An open-open tube of air has length L. Which graph shows the m = 3 standing wave in this tube? An open-closed tube of air of length L has the closed end on the right. Which graph shows the m = 3 standing wave in this tube? The following tubes all support sound waves at their fundamental frequency. Which tube has the lowest fundamental frequency?
Which of the following changes will increase the frequency of the lowest-frequency standing sound wave in an open-open tube? Choose all that apply. A. Closing one end of the tube B. Replacing the air in the tube with helium C. Reducing the length of the tube D. Increasing the temperature of the air in the tube At room temperature, the fundamental frequency of an open-open tube is 500 Hz. If taken outside on a cold winter day, the fundamental frequency will be A. Less than 500 Hz B. 500 Hz C. More than 500 Hz Two speakers are emitting identical sound waves with a wavelength of 4.0 m. The speakers are 8.0 m apart and directed toward each other, as in the following diagram. At each of the noted points in the previous diagram, the interference is A. Constructive. B. Destructive. C. Something in between. Two loudspeakers emit sound waves with the same wavelength and the same amplitude. The waves are shown displaced, for clarity, but assume that both are traveling along the same axis. At the point where thedot is, A. The interference is constructive. B. The interference is destructive. C. The interference is somewhere between constructive and destructive. D. There’s not enough information to tell about the interference. Two loudspeakers emit sound waves with the same wavelength and the same amplitude. Which of the following would cause there to be destructive interference at the position of the dot? A. Move speaker 2 forward (right) 1.0 m B. Move speaker 2 forward (right) 0.5 m C. Move speaker 2 backward (left) 0.5 m D. Move speaker 2 backward (left) 1.0 m E. Nothing. Destructive interference is not possible in this situation.
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