L5 Ultrasound

Ultrasound 1
A. 1−20MHz

Ultrasound 2
A. piezoelectricity

Ultrasound 3
A. interface
B. The difference in the acoustic impedance of the two media
C. Because the amplitude of reflection from a surface between air and liquid is too great

Ultrasound 4
A. y-axis: intensity x-axis: time of echo
B. Just click "Show Answer"

Ultrasound 5
A. The A scan head contains a single crystal, whereas the B scan head contains several smaller crystals oriented at different angle

Ultrasound 6
A. To keep air from coming between the ultrasound head and the skin surface

Ultrasound 7
A. 1, 3, 4, 6

Ultrasound 8
A. 1, 2, 3, 4, 5, 6

Ultrasound 9
A. 0.064 m 

Ultrasound 10
A. Measuring the speed of blood flow in veins or arteries.