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blsea [12.9K]
3 years ago
15

(a) Find the size of the smallest detail observable in human tissue with 20.0-MHz ultrasound. (b) Is its effective penetration d

epth great enough to examine the entire eye (about 3.00 cm is needed)? (c) What is the wavelength of such ultrasound in 0ºC air?
Physics
1 answer:
koban [17]3 years ago
5 0

Answer:

(a) λ=77×10⁻⁶m

(b)Yes its enough to examine entire eye,

(c)λ=16.65μm.

Explanation:

The ultrasonic sound are used to detect problems in human body by using device consisting of transmitter and detector .

The speed of sound in human tissue is 1540m/s.

The wavelength of sound is 20MHz.

(a) let the velocity of sound in human tissue is v = 1540m/s.

                v=fλ

           λ= \frac{v}{f} =\frac{1540}{20MHz} = 77×10⁻⁶m

             λ=77×10⁻⁶m

(b)  we can scan effectively upto the depth of  about 500λ

                   500λ=500× (77×10⁻⁶)= 3.85cm

            Yes its enough to examine entire eye,

(c) In air the  velocity of sound is 331m/s.

              λ=\frac{v}{f}  = \frac{331 m/s}{20Mhz}  = 16.65μm

            λ=16.65μm.

           

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