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Physics ch. 19

Terms in this set (127)

change in frequency is due to the _______.
doppler shift aka doppler frequency
increase in frequency as it _______ us.
approaches
decrease in frequency as it moves ______ us.
past
the frequency only changes when there is a ______ in the source and receiver position.
change
there is no change when the source and receiver remain _____.
constant
this is the primary physical principle which is used to measure the velocity of blood in the circulation
doppler
the doppler shift is a low frequency that "rides" on ____ of the much higher transducer frequency.
top
transducer frequencies are _______.
ultrasound.
transducer frequencies range from _____ MHz to _____ MHz.
2-10
doppler shifts are ______.
audible sound
doppler shift frequencies range from ______ Hz to ______ Hz.
20-20,222
separating transducer & doppler shift frequencies is done in the system and is called _______.
demodulation
doppler shift (Hz) = ______ frequency - ______ frequency
reflected, transmitted
what is created when transmitted sound waves strike moving RBC's?
doppler shifts
what is created when the change (reflected signal) is higher than the original frequency?
positive shifts
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