US physics mock test for chapter 7-11 final.
The beam diverges because of inadequate damping
The beam diverges in the Near zone
The beam of an unfocused transducer diverges
The length of the Fresnel zone is long
Density of tissues and the speed of sound in tissues
Mechanical deformation that results from high voltage applied on faces of the crystal and in turn generates ultrasound
Piezoelectric crystal subjected to pressure resulting in electrical charge appearing on their surfaces
Having a damaging effect on crystal due to high voltage
Increase in size
Decrease in size
Loses it's polarization
Increase or decrease in size depending on the voltage polarity