DMS 104, MIDTERM EXAM QUESTIONS WITH
COMPLETE SOLUTIONS
. Is the time it takes for the wave to transition from compression
through rarefaction and back to compression true or false
Correct Answers True
0.005m/s is equal to _____, can have many different variables
true or false Correct Answers Ture
5 MHz denotes Correct Answers 5 million cycles per second
A natural property of sound waves to spread out the further they
travel from the source is known as Correct Answers Diffraction
A pair of waves are in phase if these waves interfere with each
other what will occur Correct Answers Constructive
interference
A wave of acoustic energy is leaving soft tissue and transmitting
into sat with a 45° incident angle what is true of the angle of
transmission Correct Answers Less than 45°
Absorption is best characterized as Correct Answers energy
converted to heat
Absorption is the conversion of sound into Correct Answers
Heat
Acoustic impedance is a property of the _____ and has units of
__ Correct Answers medium, Rayls
, As an ultrasound wave propagates through a body the amplitude
usually Correct Answers decreases
As an ultrasound wave travels through the body it's amplitude
usually decreases true or false Correct Answers True
Attenuation and propagation speed are directly related true or
false Correct Answers False
Defuse reflection occurs as a result of a smooth surface verses
and a regular one true or false Correct Answers False
High frequency results in _____ penetration and ____
absorption Correct Answers Decreased, increased
How far away is an object if it takes it .002 ms to return in soft
tissue Correct Answers 0.00154m
How long will it take for sound to make around trip to and from
the skin surface to a reflector 1 cm deep in soft tissue Correct
Answers 13us
How much attenuation will occur after traveling through 10 cm
of soft tissue with at 3 MHz transducer Correct Answers 24 dB
I must understand sonographic physics to be successful in
becoming a registered sonographer true or false Correct
Answers True
COMPLETE SOLUTIONS
. Is the time it takes for the wave to transition from compression
through rarefaction and back to compression true or false
Correct Answers True
0.005m/s is equal to _____, can have many different variables
true or false Correct Answers Ture
5 MHz denotes Correct Answers 5 million cycles per second
A natural property of sound waves to spread out the further they
travel from the source is known as Correct Answers Diffraction
A pair of waves are in phase if these waves interfere with each
other what will occur Correct Answers Constructive
interference
A wave of acoustic energy is leaving soft tissue and transmitting
into sat with a 45° incident angle what is true of the angle of
transmission Correct Answers Less than 45°
Absorption is best characterized as Correct Answers energy
converted to heat
Absorption is the conversion of sound into Correct Answers
Heat
Acoustic impedance is a property of the _____ and has units of
__ Correct Answers medium, Rayls
, As an ultrasound wave propagates through a body the amplitude
usually Correct Answers decreases
As an ultrasound wave travels through the body it's amplitude
usually decreases true or false Correct Answers True
Attenuation and propagation speed are directly related true or
false Correct Answers False
Defuse reflection occurs as a result of a smooth surface verses
and a regular one true or false Correct Answers False
High frequency results in _____ penetration and ____
absorption Correct Answers Decreased, increased
How far away is an object if it takes it .002 ms to return in soft
tissue Correct Answers 0.00154m
How long will it take for sound to make around trip to and from
the skin surface to a reflector 1 cm deep in soft tissue Correct
Answers 13us
How much attenuation will occur after traveling through 10 cm
of soft tissue with at 3 MHz transducer Correct Answers 24 dB
I must understand sonographic physics to be successful in
becoming a registered sonographer true or false Correct
Answers True
