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∘C and killing it. A range of frequencies and intensities can be used, but in one treatment a beam of frequency 3.60 MHz. produced an intensity of 1400.0 W/cm2. The energy was delivered in short pulses for a total time of 2.70 s. over an area measuring 1.20 mm by 5.20 mm. The speed of sound in the soft tissue was 1580 m/s, and the density of that tissue was 1500.0 kg/m3. What was the wavelength ? of the ultrasound beam? How much energy ?total was delivered to the tissue during the 2.70s treatment?
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
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∘C and killing it. A range of frequencies and intensities can be used, but in one treatment a beam of frequency 3.60 MHz. produced an intensity of 1400.0 W/cm2. The energy was delivered in short pulses for a total time of 2.70 s. over an area measuring 1.20 mm by 5.20 mm. The speed of sound in the soft tissue was 1580 m/s, and the density of that tissue was 1500.0 kg/m3.
What was the wavelength ? of the ultrasound beam?
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