High‑intensity focused ultrasound (HIFU) is one treatment for certain types of cancer. During the procedure, a narrow beam of high‑intensity ultrasound is focused on the tumor, raising its temperature to nearly 90 degrees Celsius
High‑intensity focused ultrasound (HIFU) is one treatment for certain types of cancer. During the procedure, a narrow beam of high‑intensity ultrasound is focused on the tumor, raising its temperature to nearly 90 degrees Celsius and killing it. A range of frequencies and intensities can be used, but in one treatment a beam of frequency 3.10 MHz3.10 MHz produced an intensity of 1625.0 W/cm2 The energy was delivered in short pulses for a total time of 2.90 s over an area measuring 1.20 mm by 5.30 mm. The speed of sound in the soft tissue was 1590 m/s, and the density of that tissue was 1498.0 kg/m3
What was the wavelength λ of the ultrasound beam in meters?
How much energy Etotal was delivered to the tissue during the 2.90 s treatment in Joules?
What was the maximum displacement A of the molecules in the tissue as the beam passed through?
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