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A bat flying at 8 m/s emits a chirp at 400 Hz, which is reflected by...

  1. A bat flying at 8 m/s emits a chirp at 400 Hz, which is reflected by a wall.
    1. (7.5 points) What is the frequency of the echo received by the bat? (Hint: the walls reflects the same frequency signal as it receives it)
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