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6. The figure shows four situations in w..-阿摩線上測驗
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6. The figure 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) ①,③,②,④
(D) ②,①,④,③
(E) ②,①,③,④