medium · MCAT chem-phys
During an echocardiogram, a stationary transducer emits an ultrasound wave toward the blood flowing in an artery. The reflected wave detected by the transducer has a lower frequency than the emitted wave.
What does this indicate about the blood flow?
- The blood is flowing at a constant speed perpendicular to the transducer.
- The blood is flowing away from the transducer.
- The blood is flowing toward the transducer.
- The blood is turbulent and lacks a clear direction.
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