14. Karen flies a motorized toy airplane with a frequency of 200 Hz in a circle with a speed of 18.0 m/s. Caroline stands nearby and hears a Doppler shift as the plane approaches and recedes from her. What are the highest and lowest frequencies Caroline hears. *       a. 234 Hz and 170 Hz       b. 256 Hz and 165 Hz       c. 211 Hz and 190 Hz       d. 234 Hz and 185 Hz       e. None of the above

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