The person who hears the train horn at a lower pitch is A.
What is pitch?
Pitch of any sound wave is directly proportional to the frequency. The higher frequency instruments have higher pitch.
As the train in the image (attached) moves to the right, Person A and B are sitting in the train. Person C and D are standing outside the train.
Person A's velocity relative to the train is 0. So, the pitch of the horn will not change.
Therefore, the person A will hear the train at lower pitch.
Learn more about pitch.
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