please help, i am having a lot of difficulty with this. Medical ultrasound waves

Question

please help, i am having a lot of difficulty with this.

Medical ultrasound waves travel at about 1500 m/s in soft tissue. Higher frequencies provide clearer images but don't penetrate to deeper organs. Find the wavelengths of 8.9MHz ultrasound used in fetal imaging. Express your answer to two significant figures and include the appropriate units. Find the wavelengths of 3.0MHz ultrasound used to image an adult's kidneys. Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

frequency*wavelength=speed

a)or x=1500/(8.9*10^6)

or x=1.685*10^-4 m

b)x=1500/(3*10^6)

or x=5*10^-4 m

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