Question 14
One reflector is 5 times deeper than another. The time of
flight of sound to the deeper structure is the time of flight of
the shallower reflector.
less than
five times more than
equal to
one fifth as much as
Question 15
2 Points
The redirection of a portion of the sound beam back to the
transducer is known as:
reflection
refraction
Snell's Law
interface
Question 16
2 Points
Attenuation decreases with increasing ________.
intensity
wavelength
frequency
path length
Question 17
2 Points
As frequency decreases the depth to which the sound beam will
penetrate will:
decrease
increase
neither
Question 18
2 Points
Specular reflection occurs at a:
large tissue surface
large and smooth tissue interface
small tissue interface
rough tissue interface
Question 19
2 Points
The product of tissue density and ultrasound velocity is known
as:
acoustic coefficient
acoustic impedance
interface
reflectivity
Question 20
2 Points
A type of non-specular reflection that oeeurg at irregular or
rough interfaces is known as:
refraction
reflection
deflection
scatter
Question 21
2 Points
A 3 dB change in a value intensity means?
the value has tripled
The value has decreased 30%
the value has increased 30%
the value has doubled
Question 22
2 Points
Sound propagates from one medium with a density of 1.16 kg/m3
to a second medium with a density of 1.02 kg/m 3 . If the angle of
transmission is 49 0 , what can be correctly stated about the angle
of incidence?
it is equal to 49 0
it cannot be determined
it is less than 49 0
it is greater than 49 0
Question 23
2 Points
Absorption is the:
redirection of the sound beam
the return of the sound beam to the transducer
the conversion of the sound into energy
an increase in amplitude
Question 24
2 Points
Which of the following is true of diffuse reflections?
sound reflects in many directions
they're created by smooth boundaries
they're created by large reflectors
they do not appear in soft tissue
Question 25
2 Points
6. An echo caused by the bending of the sound beam is known
as:
refraction
scatter
reflection
transmission
Question 26
2 Points
Attenuation is the weakening of absorption as sound travels
through a medium.