The human ear canal (Fig. 13.3) is typically about 2.4 cm long, is roughly cylindrical, and is closed at one end where it is capped by the eardrum.?

(a) What is the fundamental frequency of the ear canal??

(b) Determine the range of frequencies where the ear is most sensitive (see Fig. 13.4). How does the ear canal?s fundamental frequency compare?

Figure 13.4

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Onset of damage to ear 140 102 120 10 100 10-2 80 10-4 60 10-6 40 10-8 20 10-10 10-12 -20 31 62 125 250 500 1000 4000 Frequency (Hz) 16,000 Each contour line has Threshold of Intensity (W/m) B = intensity level (dB)