P18 009

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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

4.5

× 10

6

Hz

= 7.62

× 10

5

m .

(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

× 10

6

Hz) = 3.33

× 10

4

m.


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