Stars, which are constantly moving away from Earth, have a red tint to them because of the Doppler effect. Also, think of a car moving past you. If you're standing stationary on a sidewalk, and you hear a car approaching, passing, and then moving away from you, the pitch of the engine changes. This is also because of the Doppler effect.
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A carotid doppler is an ultrasound test that measures how much blood is flowing to the brain from the large carotid arteries. If you have suffered a stroke, your doctor will recommend this test.
Like the Doppler effect, the source of the waves is moving, this time in the same direction as the wave front and therefore catching up to the waves that were produced earlier, resulting in a bunching up effect of waves in front of the source and a spreading out of wave fronts behind the source. Does this look like a bow to you>
Yes
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Yes. you will likely be hearing both yours and the babies. depending on the angle you point the Doppler at.