DMS 216 CH. 6 QUESTIONS WITH
CORRECT ANSWERS
\.Every 3 dB means that the intensity will ________. - ANSWERS✔-double
\.Every 10 dB change means that the intensity will ________. - ANSWERS✔-
Increase 10 times
\.A reduction in the intensity of a sound beam to one-half of its original value is
_____ dB. - ANSWERS✔--3dB
\.A reduction in the intensity of a sound beam to one-quarter of its original value
is _____ dB. - ANSWERS✔--6dB
\.-10 dB means that the intensity is reduces to ________ of its original value. -
ANSWERS✔-one-term
\.dB is a mathematical representation with a ________ scale. - ANSWERS✔-A.
logarithmic and relative
\.True or False. We need one intensity to calculate decibels. - ANSWERS✔-False
, \.A wave's intensity is 2 mW/cm^2. There is a change of +9 dB. What is the final
intensity? - ANSWERS✔-C. 16 mW/cm^2
\.If the final intensity is more than the initial intensity then the gain in dB is
_________ (+ or -). - ANSWERS✔-Positive. The beam's intensity is increasing.
\.If the initial intensity of a sound beam is less than the final intensity, then the
gain in dB is _____ (+ or -). - ANSWERS✔-Positive. The beam's intensity is
increasing.
\.Name the three components of attenuation. - ANSWERS✔-absorption,
reflection, scattering
\.As the path length increases, the attenuation of ultrasound in soft tissue
_______. - ANSWERS✔-increases.
\.Attenuation in lung tissue is [less than, greater than, the same as] attenuation in
soft tissue. - ANSWERS✔-greater than
\.Attenuation in bone is _________ attenuation in soft tissue. - ANSWERS✔-
greater than
\.Attenuation in air is _______ attenuation in soft tissue. - ANSWERS✔-greater
than
CORRECT ANSWERS
\.Every 3 dB means that the intensity will ________. - ANSWERS✔-double
\.Every 10 dB change means that the intensity will ________. - ANSWERS✔-
Increase 10 times
\.A reduction in the intensity of a sound beam to one-half of its original value is
_____ dB. - ANSWERS✔--3dB
\.A reduction in the intensity of a sound beam to one-quarter of its original value
is _____ dB. - ANSWERS✔--6dB
\.-10 dB means that the intensity is reduces to ________ of its original value. -
ANSWERS✔-one-term
\.dB is a mathematical representation with a ________ scale. - ANSWERS✔-A.
logarithmic and relative
\.True or False. We need one intensity to calculate decibels. - ANSWERS✔-False
, \.A wave's intensity is 2 mW/cm^2. There is a change of +9 dB. What is the final
intensity? - ANSWERS✔-C. 16 mW/cm^2
\.If the final intensity is more than the initial intensity then the gain in dB is
_________ (+ or -). - ANSWERS✔-Positive. The beam's intensity is increasing.
\.If the initial intensity of a sound beam is less than the final intensity, then the
gain in dB is _____ (+ or -). - ANSWERS✔-Positive. The beam's intensity is
increasing.
\.Name the three components of attenuation. - ANSWERS✔-absorption,
reflection, scattering
\.As the path length increases, the attenuation of ultrasound in soft tissue
_______. - ANSWERS✔-increases.
\.Attenuation in lung tissue is [less than, greater than, the same as] attenuation in
soft tissue. - ANSWERS✔-greater than
\.Attenuation in bone is _________ attenuation in soft tissue. - ANSWERS✔-
greater than
\.Attenuation in air is _______ attenuation in soft tissue. - ANSWERS✔-greater
than
