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Ultrasound is the name given to frequencies above the human range of hearing, which is about 20000 {\rm Hz}.

Ultrasound is the name given to frequencies above the human range of hearing, which is about 20000 {rm Hz}. Waves above this frequency can be used to penetrate the body and to produce images by reflecting from surfaces. In a typical ultrasound scan, the waves travel with a speed of 1500 {rm m/s}. For a good detailed image, the wavelength should be no more than 1.0 {rm mm}. What frequency is required?

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