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Diagnostic ultrasound of frequency 4.92 MHz is used to examine tumors in soft tissue. (a) What...

Diagnostic ultrasound of frequency 4.92 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 1370 m/s, what is the wavelength of this wave in tissue? (Take the speed of sound in air to be 343 m/s.)

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Answer #1

a)

frequency = 4.92 MHz

wavelength of sound in air = speed of sound in air/frequency

wavelength of sound in air = 343/(4.92 *10^6)

wavelength of sound in air = 6.97 *10^-5 m

the wavelength of sound in air is 6.97 *10-5 m

b) for the wavelength of sound in tissue

wavelength of sound in tissue = speed of sound in air/frequency

wavelength of sound in tissue = 1370/(4.92 *10^6)

wavelength of sound in tissue = 2.78 *10^-4 m

the wavelength of sound in tissue is 2.78 *10-4 m

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