Two speakers, s, and s,, are located 0.590 m apart as shown in the figure below. Sally stands 0.910 m away from speaker s,, indicated by the "X" on the figure. The speakers are connected to an adjustable oscillator and always emit the same sound in phase at the same frequency. (Use 343 m/s for the speed of sound in your calculations.) - X S, (a) If Sally cannot hear anything at her location due to destructive interference of sound from the two speakers, what is the lowest possible frequency of sound the speakers emit? Hz (b) The frequency is now changed to 2139 Hz. Sally stands at the same point. Her friend Mark moves speaker s, (along the same axis) to the closest point to speaker s,, but not coinciding with such that Sally hears a maximum of sound intensity. What is the new distance between s, and s,? m

We know that a speaker that is 3m away from us is playing music at an intensity of 0.89W/m2. What is the power of this speaker?               Another speaker is playing at an intensity of 1.2W/m2 and a power of 2W. How far away is this speaker from us?                 What is the difference between constructive and destructive interference? Give an example of each.                   If you know that the interference of 2 waves creates a wavelength of a wave is 4.5m, can you determine if the interference is constructive or destructive? How do you know?             If one note has a frequency of 132Hz and another has a frequency of 148Hz. What is the beat frequency?     A vocal tract has a length of 15.3cm and is represented by the 3rd harmonic. 6a. How many nodes are there in the 3rd harmonic?         6b. What is the wavelength of the 3rd harmonic?               6c. What is the frequency of the 3rd harmonic?                 6d. What is the wavelength of the 4th harmonic?…

For testing purposes, a musical instrument manufacturing company creates a device so that when you blow into one end with your instrument, sound comes out the other end in opposite directions. A sound technician uses a whistle and generates sound waves with a frequency of 280 Hz. The waves travel in opposite directions in a sound studio, are reflected by end walls, and return. The studio is 43.0 m long and the whistle is located 14.0 m from one end. What is the phase difference (in degrees) between the reflected waves when they meet at the source of the sound? The speed of sound in air is 343 m/s. 17044.898X See if you can determine the path difference and the wavelength, and then express the path difference in terms of the wavelength. What part of the path difference is of interest to us when finding the phase difference? How is this part of the path difference related to the phase difference? • Need Help? Read It

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