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... I already solved for this question ...

... What is the frequency of the sound detected by sub B (to the nearest Hz)? ...

... I used the Doppler equation and I got 1549 Hz as an answer, which is correct.

... My next question is ...

...

**Part of the sonar wave is reflected from B and returns to A. What frequency does A detect for this reflected wave (to the nearest Hz)?**

... do I use the Doppler equation again ... or is there a reflection equation or concept that I missed out on?