GB SPI REVIEW QUESTIONS PT3 Questions and Verified
Answers || Graded A+ | 2025|2026 EXAM UPDATE
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 - C
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 - D
A sound beam with an intensity of 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% - C
If the ____ of two media are different and sound strikes a border between the media at 90 degree
incidence, then reflection will occur.
A. conductances
B. densities
,C. impedances
D. propagation speeds - C
True or false? The proportion of the incident intensity that is reflected at a border between two
media will increase as the impedances of the media become increasingly dissimilar. - True
A sound pulse strikes a boundary between two media with normal incidence. The speed of sound
in the two media are very different; however, the impedances of the media are identical. What will
happen?
A. a big echo will be produced
B. a medium echo will result
C. a small echo will result
D. there will be no echo at all - D
Two acoustic waves strike a boundary between two media. The waves are traveling in a direction
90 degrees to the boundary. Reflection of these waves depends on differences in the __________.
a. Frequencies of the two waves
b. Propagation speeds of the two media
c. Amplitudes of the two waves
d. Impedances of the two media - D
An ultrasound wave approaches an interface between two media at a 90 degree angle. The
propagation speeds and the densities of the two media are different. Which is correct?
A. reflection will definitely occur
B. reflection will definitely not occur
C. refraction may occur
D. none of the above - D
An ultrasound wave strikes an interface between two media at a 90 degree angle. The propagation
speeds of the media are identical. However, the densities of the media are different. Which is true?
, a. Reflection will definitely occur
b. Reflection will definitely not occur
c. Refraction may occur
d. None of the above - A
An acoustic wave is traveling from medium X to medium Z. Medium X has a propagation speed
of 1,457 m/sec and an impedance of 1.44 MRayls. Medium Z's propagation speed is 1,644 m/s and
its impedance is 1.26 MRayls. The angle of incidence is 32 degrees. What is true of the angle of
reflection?
A. it is greater than 32 degrees
B. it is equal to 32 degrees
C. it is less than 32 degrees
D. cannot be determined - B
True or false? When reflection occurs with oblique incidence, the angle of reflection equals the
angle of incidence. This is known as Snell's law. - False
What event does Snell's law govern?
A. transmission
B. refraction
C. impedance - B
Which of the following best describes the process described by Snell's law?
a. Reflection with normal incidence
b. Reflection with oblique incidence
c. Transmission with normal incidence
d. Transmission with oblique incidence - D
Answers || Graded A+ | 2025|2026 EXAM UPDATE
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 - C
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 - D
A sound beam with an intensity of 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% - C
If the ____ of two media are different and sound strikes a border between the media at 90 degree
incidence, then reflection will occur.
A. conductances
B. densities
,C. impedances
D. propagation speeds - C
True or false? The proportion of the incident intensity that is reflected at a border between two
media will increase as the impedances of the media become increasingly dissimilar. - True
A sound pulse strikes a boundary between two media with normal incidence. The speed of sound
in the two media are very different; however, the impedances of the media are identical. What will
happen?
A. a big echo will be produced
B. a medium echo will result
C. a small echo will result
D. there will be no echo at all - D
Two acoustic waves strike a boundary between two media. The waves are traveling in a direction
90 degrees to the boundary. Reflection of these waves depends on differences in the __________.
a. Frequencies of the two waves
b. Propagation speeds of the two media
c. Amplitudes of the two waves
d. Impedances of the two media - D
An ultrasound wave approaches an interface between two media at a 90 degree angle. The
propagation speeds and the densities of the two media are different. Which is correct?
A. reflection will definitely occur
B. reflection will definitely not occur
C. refraction may occur
D. none of the above - D
An ultrasound wave strikes an interface between two media at a 90 degree angle. The propagation
speeds of the media are identical. However, the densities of the media are different. Which is true?
, a. Reflection will definitely occur
b. Reflection will definitely not occur
c. Refraction may occur
d. None of the above - A
An acoustic wave is traveling from medium X to medium Z. Medium X has a propagation speed
of 1,457 m/sec and an impedance of 1.44 MRayls. Medium Z's propagation speed is 1,644 m/s and
its impedance is 1.26 MRayls. The angle of incidence is 32 degrees. What is true of the angle of
reflection?
A. it is greater than 32 degrees
B. it is equal to 32 degrees
C. it is less than 32 degrees
D. cannot be determined - B
True or false? When reflection occurs with oblique incidence, the angle of reflection equals the
angle of incidence. This is known as Snell's law. - False
What event does Snell's law govern?
A. transmission
B. refraction
C. impedance - B
Which of the following best describes the process described by Snell's law?
a. Reflection with normal incidence
b. Reflection with oblique incidence
c. Transmission with normal incidence
d. Transmission with oblique incidence - D
