How to Determine the Sign of the Doppler Shift?

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SUMMARY

The discussion centers on determining the sign of the Doppler shift in relation to relative velocity. It clarifies that both the problem statement and the provided answer indicate that the sign of the shift indicates whether the relative velocity is positive or negative. The key focus is on the method for determining the sign of the Doppler shift itself, rather than the implications of the sign.

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Homework Statement
If the velocity of the target is positive, ∆𝑓 > 0.
If the velocity of the target is negative, ∆𝑓 < 0. How to identify the sign of ∆𝑓 in Doppler system?

Did I answer it correctly? thank you
Relevant Equations
I put that in the picture below
Screen Shot 2022-06-08 at 16.46.17.png

answer:
Screen Shot 2022-06-08 at 18.02.51.png
 
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I don't know what answer is wanted. As I read it, both the problem statement and your answer assert that the sign of the shift tells you whether the relative velocity is positive or negative. But the question is asking how you determine the sign of the shift, no?
 

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