You are standing near a large 3 blade wind turbine and count that it does 15 complete rotations per minute. Each time one of the blades passes the tower you hear a “whomp" like noise. What would be the frequency of this noise be if you were driving away from the tower at 40km/h into a 10 km/h headwind? Give your answer in Hz. A diagram which includes the source of the sound, your position as the observer and the direction of the wind should be included in your answer.

You are standing near a large 3 blade wind turbine and count that it does 15 complete rotations per minute. Each time one of the blades passes the tower you hear a “whomp" like noise. What would be the frequency of this noise be if you were driving away from the tower at 40km/h into a 10 km/h headwind? Give your answer in Hz. A diagram which includes the source of the sound, your position as the observer and the direction of the wind should be included in your answer.