The Diagram Shows Four Situations in Which a Source of Sound

question 59

Multiple Choice

The diagram shows four situations in which a source of sound S and a detector D are either moving or stationary. The arrows indicate the directions of motion. The speeds are all the same. Detector 3 is stationary. Rank the situations according to the frequency of the source, lowest to highest.

• A) 1, 2, 3, 4
• B) 4, 3, 2, 1
• C) 1, 3, 4, 2
• D) 2, 1, 2, 3
• E) None of the above

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