Explanation A megaphone may be defined as extension of the vocal tract of human beings. It directs that wasted acoustic power forward to increase the sound to a listener in front of the speaker. Therefore the acoustic impedance of the whole system rises so the pressure and volume flow variations at your vocal chords may grove. According to Huygens Principle sound is expanding to all directions but the intensity of sound may or may not be same in all directions. The Megaphone concentrates the intensity in its direction. From the cone of the megaphone comes a narrow spherical wave with pronounced directivity and the diffraction is not so significant. A simple test, The average diameter of an open mouth is 5 cm , the speed of sound is 343 m / s and frequency is 3000 Hz . Write the expression for diffraction. sin θ = n λ d (1) Here, θ is the diffraction angle. n is the order of maxima. λ is the wavelength of sound. d is diameter of an open mouth. Write the expression for wavelength of sound. λ = v f Here, v is the velocity of sound. f is the frequency of sound. Substitute v f for λ in equation (1)

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN: 9781305116399

Author: Raymond A. Serway, John W. Jewett

Publisher: Cengage Learning

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Chapter 38, Problem 38.12CQ

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A theoretical description of how a megaphone works.

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Physics for Scientists and Engineers, Technology Update (No access codes included)

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A theoretical description of how a megaphone works.

Solution Summary: The author explains that a megaphone is an extension of the vocal tract of human beings.

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