Question #19

Which of the following causes the largest change in Doppler shift?

A. Changing the angle between beam and moving object from 0 to 20 degrees
B. Changing the velocity of object from 1 to 2 m/s
C. Changing the transducer frequency from 3 to 6 MHz
D. Changing medium from blood to lung tissue.
E. All represent approximately the same degree of shift