Akiko rides her bike toward a brick wall with a speed of 7.00 m/s while blowing a

Question:

Akiko rides her bike toward a brick wall with a speed of 7.00 m/s while blowing a whistle that is emitting sound with a frequency of 512.0 Hz.

(a) What is the frequency of the sound that is reflected from the wall as heard by Haruki, who is standing still?

(b) Junichi is walking away from the wall at a speed of 2.00 m/s. What is the frequency of the sound reflected from the wall that Junichi hears?

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