Physics Mock Test Ch 7-11
3 Questions
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US physics mock test for chapter 7-11 final.
Questions and Answers
- 1.In the Fraunhofer zone:
- A.
The beam diverges because of inadequate damping
- B.
The beam diverges in the Near zone
- C.
The beam of an unfocused transducer diverges
- D.
The length of the Fresnel zone is long
- 2.The piezoelectric effect can be described as:
- A.
Density of tissues and the speed of sound in tissues
- B.
Mechanical deformation that results from high voltage applied on faces of the crystal and in turn generates ultrasound
- C.
Piezoelectric crystal subjected to pressure resulting in electrical charge appearing on their surfaces
- D.
Having a damaging effect on crystal due to high voltage
- 3.
- A.
Increase in size
- B.
Decrease in size
- C.
Loses it's polarization
- D.
Increase or decrease in size depending on the voltage polarity
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