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Halliday 2 Cap 18 - P18 009

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    December 2018
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9. (a) Using λ = v/f , where v is the speed of sound in air and f is the frequency, we find λ= 343 m/s = 7.62 × 10−5 m . 4.5 × 106 Hz (b) Now, λ = v/f , where v is the speed of sound in tissue. The frequency is the same for air and tissue. Thus λ = (1500 m/s)/(4.5 × 106 Hz) = 3.33 × 10−4 m.