Signora Bianca Castafiore is not loved by Captain Haddock. He is very irritated

Question

Signora Bianca Castafiore is not loved by Captain Haddock. He is very irritated at her piercing 'noise'. She is a loud soprano, who can produce a high C with a frequencies of 1000 Hz, 2000 Hz, 3000 Hz, ... at an intensity level of 105 dB - 140 dB at a distance of 10 cm from her mouth. Explain why Haddock is particularly irritated by the sound, by referring to the figure below (the curves are of equal loudness). Signora Bianca Castafiore is claimed to break windows and wine glass with her voice. A typical wine glass might have a fundamental frequency of 900-1000 Hz. Does the breaking of a glass depend upon loudness or intensity? Explain how the wine glass might break (and ignore Mythbusters), as presented in lectures. Haddock is also pretty loud, but is a bass. When he sings (or shouts) a low G, he produces harmonics at 100 Hz, 200 Hz, 300 Hz, ... At 10 cm he can reach an intensity of 105 db at 100 Hz. Is it likely that he can break glasses just using his voice? Explain why or why not. When looking at Castafiore's high C or Haddock's low G, there is an interesting pattern. The fundamental is very loud, the next is quite weak, and the third harmonic is very strong. Explain this in terms of organ pipes, and in particular explain whether the human voice is best represented by an open organ pipe or a half-closed organ pipe.

Explanation / Answer

a)after 2000hz the change in intensity is more, it began to decrease and increase more. hence the irritation occurs b)when resonance in frequencies occurs then vibrations occur in the object. Hence when the frequency os sound is equal to the frequency of glass it breaks. c)it is also possible because for haddock the intensity of sound is more at low frequencies. as the frequency increases the intensity of sound also increases at very low frequencies. Hence breaking of glass is possible. d)human voice is an pen organ pipe.

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