Incidence

Question 1

Which of the following describes an angle with a measure of 45 degrees?

a. orthogonal
b. acute
c. obtuse
d. normal

Answer 1

b. acute

Question 2

Which of the following describes an angle with a measure of 123 degrees?

a. orthogonal
b. acute
c. obtuse
d. normal

Answer 2

c. obtuse

Question 3

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

Answer 3

d. orthogonal

Question 4

Which term does not belong in the group below?

a. orthogonal
b. at right angles
c. oblique
d. 90degrees
e. normal
f. perpendicular

Answer 4

c. oblique

Question 5

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

Answer 5

d. oblique

Question 6

Which term has a meaning other than normal incidence?

a. orthogonal incidence
b. perpendicular incidence
c. oblique incidence

Answer 6

c. oblique incidence

Question 7

What are the units of intensity transmission coefficient?

a. watts/square cm
b. watts
c. dB
d. none of the above

Answer 7

d. none of the above

Question 8

What are the units of the intensity reflection coefficient?

a. none
b. W/cm^2
c. watts
d. dB

Answer 8

a. none

Question 9

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.

Answer 9

a. intensity reflection coefficient

Question 10

An ultrasound wave strikes a boundary between two media. All intensities are measured directly at the boundary. What results when the transmitted intensity is divided by the reflected intensity?

a. intensity reflection coefficient
b. intensity transmission coefficient
c. beam uniformity coefficient
d. none of the above

Answer 10

d. none of the above

Question 11

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?

a. intensity reflection coefficient
b. intensity transmission coefficient
c. beam uniformity coefficient
d. none of the above

Answer 11

b. intensity transmission coefficient

Question 12

What results when the intensity transmission coefficient and the intensity reflection coefficient are added together?

a. incident intensity coefficient
b. acoustic impedance
c. total intensity
d. 1.0

Answer 12

d. 1.0

Question 13

What remains when the reflected intensity is subtracted from the incident intensity?

a. 1.0
b. incident intensity
c. transmitted intensity coefficient
d. transmitted intensity

Answer 13

d. transmitted intensity

Question 14

What is the maximum permissible value for both the intensity reflection coefficient and the intensity transmission coefficient?

a. 100
b. 1%
c. 1
d. infinity

Answer 14

c. 1

Question 15

What is the minimum permissible value for both the intensity reflection coefficient and the intensity transmission coefficient?

a. different from each other
b. -1
c. 100%
d. 0

Answer 15

d. 0

Question 16

A sound beam with an intensity of a 45 W/cm^2 strikes a boundary and 70% of the wave’s intensity is reflected. How much is transmitted?

a. 45 W/cm^2
b. 25 W/cm^2
c. 30%
d. 100%

Answer 16

c. 30%