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Diagnostic ultrasound of frequency 3.80 MHz is used to examine tumors in soft tissue. (a) What is the wavelength in air of such a sound wave? (b) If the speed of sound in tissue is 1500 m/s, what is the wavelength of this wave in tissue?

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`(a) 0.78 xx 10^(2) m or 90.3 mum , (b) 3.95 xx 10^(-4) m
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