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The modulating frequency shift provides the central band frequency at $f_b$ From Doppler effects, we know that if the object vibrates away from the source, the frequency $f_d$ decreases (negative), and if it vibrates toward the source, $f_d$ increases (positive). Now as mentioned, with the modulating frequency shift from which the detected frequency is ...

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Sound waves propagate at 340 m/s relative to the medium (air). In both cases, the relative motion of the source and receiver are the same, but the relative motions of the source and receiver with respect to the medium are different. This is what breaks the symmetry of your two setups, and why you're getting different answers. It may help to look at a ...

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Hmph, this is to do with the black body radiation spectrum. Forgive me if I'm wrong, but from what I understand, the meteor is travelling away from the observer, but it is slowed down. The image observed is redshifted, but then upon slowing down it begins to shift towards violet. I initially thought that it would be a simple shift in hue; thus avoiding ...

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