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The figure indicates the directions of m...

The figure indicates the directions of motion of a sound source and a detector for six situations in stationary air. For each situation, is the detected frequency greater than or less than the emitted frequency, or can not we tell without more information about the actual speeds?

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(a) greater , (b) less , (c ) cant. tell, ( d) cant tell , (e ) greater , (f) less
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