5. Whenever a wave is used as a probe (e.g. ultrasound), it is difficult to detect target details that is smaller than the wave's wavelength, 2. Higher frequency ultrasound would allow greater detail, but it lessen the penetration depth compared to lower frequencies. The acceptable effective scan depth is about 5002 into a tissue. (A) Calculate the minimum frequency of ultrasound that will allow you to see details as small as 0.250 mm in human tissue given the speed of sound in tissue is about 1540 m/s. (B) What is the effective depth to which this sound is effective as a diagnostic probe? Review: A = where v: speed of sound in a medium, f: frequency.
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.
Whenever a wave is used as a probe (e.g. ultrasound), it is difficult to detect target details that are smaller than the wave's wavelength . Higher frequency ultrasound would allow greater detail, but it lessens the penetration depth compared to lower frequencies. The acceptable effective scan depth is about into a tissue.
(A) Calculate the minimum frequency of ultrasound that will allow you to see details as small as 0.250 mm in human tissue given the speed of sound in tissue is about 1540 m/s.
(B) What is the effective depth to which this sound is effective as a diagnostic probe?
Review: where: speed of sound in a medium, f: frequency.
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