Suppose you are standing at rest as you watch a train approach you with a whistle that has a frequency of 1600 Hz. Describe the pitch or pitches you hear as the train approaches, passes in front of you, and travels away from you. above 1600 Hz as it approaches you; 1600 Hz as it passes by you; above 1600 Hz as it moves away from you

above 1600 Hz as it approaches you; 1600 Hz as it passes by you; below 1600 Hz as it moves away from you

1600 Hz as it approaches you; 1600 Hz as it passes by you; below 1600 Hz as it moves away from you

below 1600 Hz as it approaches you; 1600 Hz as it passes by you; above 1600 Hz as it moves away from you