Ultrasound frequency problem

[whitehorsey]

1. Ultrasound with a frequency of 4.25MHz can be used to produce images of the human body. If the speed of sound in the body is the same as in salt water 1.50km/s, what is the wavelength in the body?



2. v= wavelength(f)
M = 10^6



3. v= wavelength(f)
wavelength = v/f
= .0015/4250000
= 3.53 x 10^-10 m
I'm not sure if this is right.

 

[rl.bhat]

wavelength = v/f
= .0015/4250000
This step is wrong. 1.5km = ...m?

 

[whitehorsey]

wavelength = v/f
= .0015/4250000
This step is wrong. 1.5km = ...m?

o sorry my mistake
um so it should be (1500/4250000) which equals 3.53 x 10^-4 m?

 

[rl.bhat]

That is right.

 

[whitehorsey]

That is right.

thank you again! :]