Topic: Hearing physics. Objective and subjective characteristics of the sound. Ultrasound and infrasound
Sound is a…
The most low-frequency sound a man can hear is…
Oscillations are called infrasound when their frequency is…
Oscillations are called ultrasound when their frequency is…
Threshold of hearing is…
Threshold of hearing of the man has increased. It means that…
What are the sound frequency limits of human hearing?
What frequency is the lower limit of range of hearing?
Noise differs from tone as…
Which property is specific for simple (pure) tone?
Complex tone differs from simple tone because its oscillations…
Basic tone of a complex tone is a…
Which sound characteristic may be expressed in energy units?
A.
B.
C.
D.
E.
What crystals are called piezocrystalls and used in piezoelectric effect?
What frequency ultrasound is using in surgery & stomatology? In what way it is being produced?
What frequency ultrasound is using in diagnostics and therapeutics? In what way it is being produced?
The application of ultrasound in diagnostics is based on the phenomenon of
A
B
C
D
E
Which 3 types of scanning are common in the ultrasound diagnostics?
Ultrasound waves traverse the structures of brain and reflect from them. The mechanical waves are transformed into electric pulses of different amplitude on a display. What kind of scan is this?
Ultrasound wave is directed to the moving object & reflects from its surface. The horizontal motion of display beam represents time intervals. The vertical deflection on the display reflects the amplitude of object movements. What kind of scan is this?
This technique gives the possibility to observe two-dimensional picture of internal organs. It uses a movable ultrasound transducer.
A high-frequency ultrasound beam is directed along the blood vessel. Ultrasound is reflected from blood cells that act as the moving source of ultrasound.
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