The Diagram Shows Four Situations in Which a Source of Sound

question 23

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 (when not zero) are all the same.(Note that the detector in situation 3 is stationary) .Rank the situations according to the apparent 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, 4, 3
• E)None of the above

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