Answer: 0.392 m/s
Explanation:
The Doppler shift equation is:
[tex]f'=\frac{V+V_{o}}{V-V_{s}} f[/tex]
Where:
[tex]f=8(10)^{4} Hz[/tex] is the actual frequency of the sound wave
[tex]f'=8.002(10)^{4} Hz[/tex] is the "observed" frequency
[tex]V=1570 m/s[/tex] is the speed of sound
[tex]V_{o}=0 m/s[/tex] is the velocity of the observer, which is stationary
[tex]V_{s}[/tex] is the velocity of the source, which are the red blood cells
Isolating [tex]V_{s}[/tex]:
[tex]V_{s}=\frac{V(f'-f)}{f'}[/tex]
[tex]V_{s}=\frac{1570 m/s(8.002(10)^{4} Hz-8(10)^{4} Hz)}{8.002(10)^{4} Hz}[/tex]
Finally:
[tex]V_{s}=0.392 m/s[/tex]
