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Homework3_08_ans - Homework#3 Chapter 2 Due Feb 15 Question...

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Homework #3 Chapter 2 Due Feb. 15 Question 9 a) Hearing around corners is possible because of diffraction. One way to understand diffraction is by using Huygen’s principle. b) All other things being equal (for example assume they play with equal sound power – and assume that you can hear equally well at high and low frequencies), the tuba will be easier to hear around corners. Tubas play lower frequency notes than flutes and lower frequency sounds waves have longer wavelengths. Diffraction is more important for long wavelength waves than for short wavelength waves and it is diffraction that causes the sound power to go around a corner. Question 15 a) This is called the phenomenon of “beats”. Two such tones are exactly mathematically equivalent to someone playing the average frequency (441 Hz) while modulating the amplitude at the difference frequency (4 Hz). b) Beats are an interference effect so the two waves will not cancel perfectly if they don’t have the exact same amplitude.
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