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Exam Review Book- Impedance and Incidence
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Flashcards
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Terms in this set (20)
Acoustic impedance is a property of the ____ and has units of _____
Medium, Rayls
To calculate the acoustic impedance of a medium, one should ____ the ____ by the ____.
A. divide, propagation speed, density
B. multiply, density, propagation speed
C. divide, density, propagation speed
D. multiply, stiffness, density
B. multiply, density, propagation speed
Which two attributes help establish the acoustic impedance of a medium?
density and stiffness
Which value is closest to the impedance of soft tissue?
2,000,000 Rayls
The impedance of soft tissue is in the range of 1.5 to 2.5 million Rayls
Which describes an angle with a measure of 45 degrees?
acute- any angle that measures less than 90 degress is an acute angle
Which describes an angle with a measure of 123 degrees?
obtuse - any angle greater than 90 degrees is an obtuse angle
The angle between the direction of propagation and the boundary between two media is 90 degrees. What term describes the form of incidence of the wave?
A. not normal
B. direct
C. oblique
D. orthogonal
D. orthogonal
(exactly 90 degrees)
Which term does not belong in the group below?
A. orthogonal
B. at right angles
C. oblique
D. 90 degrees
E. normal
F. perpendicular
C. oblique
A sound wave strikes a boundary between two media at a 60 degree angle. This is called _____ incidence.
A. orthogonal
B. angular
C. obtuse
D. oblique
D. oblique
Which term has a meaning other than normal incidence?
A. orthogonal incidence
B. perpendicular incidence
C. oblique incidence
C. oblique incidence (any angle other than 90 degrees)
What are the units of the intensity transmission coefficient?
its a percentage, reported without units
What are the units of the intensity reflection coefficient?
its a percentage, reported without units
A wave strikes an interface between two media and intensities are measured at the interface. What results when the reflected intensity is divided by the incident intensity?
A. intensity reflection coefficient
B. intensity transmission coefficient
C. beam uniformity coefficient
D. none of the above
A. intensity reflection coefficient
An ultrasound wave strikes an interface between two media. All intensities are measured directly at the interface. What results when the transmitted intensity is divided by the reflected intensity?
When the transmitted intensity is divided by the reflected intensity a number is obtained. This number has no special meaning and not given a special name
An ultrasound wave strikes an interface between two media. All intensities are measured directly at the interface. What results when the transmitted intensity is divided by the incident intensity?
intensity transmission coefficient
What results when the intensity transmission coefficient and the intensity reflection coefficient are added together
1.0 or 100%
What remains when the reflected intensity is subtracted from the incident intensity?
transmitted intensity
What is the maximum permissible value for both the intensity reflection coefficient and the intensity transmission coefficient?
1.0 or 100%
What is the minimum permissible value for both the intensity reflection coefficient and the intensity transmission coefficient
0 no transmission would exist
A sound beam with an intensity of 45 W/cm2 strikes a boundary and 70% of the wave's intensity is reflected. How much is transmitted?
30 % of the waves intensity
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