Question

(a) How far apart are two layers of tissue that produce echoes having round-trip times (used to measure distances) that differ by 0.528 µs? (Use 1540 m/s as the speed of sound through human tissue.)
  
If the distance between the two layers is d, how far does to sound of interest travel? What is the relationship between the distance the sound travels, the speed at which the sound travels and the time of travel? m

(b) What minimum frequency must the ultrasound have to see detail this small?
  
How is the distance we wish to observe, related to the wavelength of ultrasound we will need to use? How are the speed, wavelength and frequency of ultrasonic waves related? Hz

Answer 1