An ultrasound pulse with frequency 3.0 MHz (f) and wavelength 0.50 mm can penetr

Question

An ultrasound pulse with frequency 3.0 MHz (f) and wavelength 0.50 mm can penetrate 10 cm (L) into a person’s body before being absorbed, useful for abdominal imaging. Assuming that for soft tissue L=C/f, where C is a constant that relates frequency and depth of soft tissue penetration, determine what frequency might be required to explore the inside of the entire eye (assuming the eye has a radius of approximately 14 mm).

I get the answer as being 0.42MHZ but this doesn't seem right. I would appreciate it if someone could have a go at this question and either confirm I am correct or wrong.

Explanation / Answer

L = C/f

Initially L= 10 cm

             f = 3 MHz

C = L*f = 10*3 MHz-cm

Now we need to find the frequency to see inside eye of 14mm radius, i.e. our Length L is equal to diameter = 14*2= 28 mm = 2.8 cm ( need to see the whole eye, use diameter not radius)

For this f = C/L = 10*3/2.8 = 10.714 MHz Answer

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.