Ultrasound can be used to deliver energy to tissues for therapy. It can penetrat

Question

Ultrasound can be used to deliver energy to tissues for therapy. It can penetrate tissue to a depth approximately 200 times its wavelength. The speed of sound

What is the approximate depth of penetration of ultrasound at a frequency of 5.2 MHz ? Use values given in table if necessary.

What is the approximate depth of penetration of ultrasound at a frequency of 5.2  ? Use values given in table if necessary.

Medium Speed(m/s) Air (0C) 331 Air (20C) 343 Helium (0C) 970 Ethyl alchohol 1170 Water 1480 Human tissue (ultrasound) 1540 Lead 1200 Aluminum 5100

Explanation / Answer

here,

the speed of sound in air and water is very different.

as you mentioned tissues, and we are mostly water, i will assume the speed of sound is that in water, which is 1480 m/s.

if you are supposed to assume a specific value for this speed in tissue, then just use that number in the prescription below....

so

wavelength * frequency = 1480 m/s

wavelength = 1480 / (5.2 * 10^6)
wavelength = 2.84 * 10^-4 m

penetration depth = 200 times that is 0.059

the depth of penetration is C. 5.9 cm

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