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Wave Speed: Ultrasound Imaging

WAVES-4IKETL

Ultrasound imaging is used to locate a tumor in a man’s abdomen. Ultrasound waves have a frequency of $7 MHz$ and when traversing human flesh have a wavelength of approximately $0.22 mm$. The wave is directed at the man's abdomen, reflect back and is detected $188 \mu s (1.88 \times 10^{-4} s)$ after the transmission.

How deep is the tumor?