The answer above is NOT correct. (1 point) READING 2 The vocal tract is a resona

Question

The answer above is NOT correct. (1 point) READING 2 The vocal tract is a resonator, and the transmission of a sound through an acoustic resonator is highly dependent upon frequency. Sounds at the resonance frequency are less attenuated than other sounds, and are therefore radiated with a higher relative amplitude, or with a greater relative loudness than other sounds. The vocal tract has four or five important resonances called formants [18]. Each formant is associated with a standing wave, that is, with a static pattern of pressure oscillations whose amplitude is at a maximum at the glottal end and near a minimum at the lip opening. The lowest formant corresponds to a quarter of a wavelength, which is to say that a quarter of its wavelength fits within the vocal tract. Similarly, the second, third and fourth formants correspond respectively to a three-quarters wavelength, one and a quarter wavelengths and one and three-quarters wavelengths [18] Johan Sundberg. "The Acoustics of the Singing Voice," SCIENTIFIC AMERICAN, March 1977. Which of the following is NOT a formant wavelength? B. 3A/4 O D. A/4

Explanation / Answer

A formant wavelength will be such that the total length of pipe = n/2 + /4.

When the above condition is satisfied then only a node is formed at the closed end and antinode at the open end.

Among the given options:

(a) 7/4 = n/2 + /4, satisfied for n = 3

(b) 3/4 = n/2 + /4, satisfied for n = 1

(c) /2 = n/2 + /4, not satisfied for any value of n, HENCE NOT A FORMANT WAVELENGTH (ANS)

(d) /4 = n/2 + /4, satisfied for n = 0

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