Assertion: ultrasound's frequency | /r/CapableOf | leave the blood
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Source sentences:
text: The frequency leaving the blood is 2,500,325 Hz, but it is shifted upward as given by [latex]f_{\text{obs}}=f_{\text{s}}\left(\frac{v_{\text{w}}}{v_{\text{w}}-v_{\text{b}}}\right)\\[/latex]. f obs is the frequency received by the speaker-microphone.