ZZ help dopplers effect PHysics?

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When Jan runs away from Lee, the Doppler effect causes the frequency of Jan's buzzer to decrease as perceived by Lee. The beat frequency increases when the difference between the two frequencies becomes larger. If Lee's frequency is f, Jan's frequency must be higher than f for the beat frequency to increase, specifically at (f + 4) Hz. Therefore, Jan has a higher frequency than Lee, which explains the observed increase in beat frequency. Understanding the relationship between frequency and the Doppler effect is crucial in this scenario.
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PLZZZ help dopplers effect PHysics?
Two students Jan & Lee Hold Buzzers which operate at different frequencies producing a beat frequenzy of 4 Hertz, When Jan runs away from Lee, Lee hears that beat frequency increaes. Who has higher frequency and why?
 
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Beat frequency is the difference in frequencies.
If Lee's frequency is f, Jan's frequency will be (f + 4) Hz or (f - 4) Hz. Jan runs away from Lee. Lee will hear the buzzer of Jan with reduced frequency. So the beat frequency will increases only if Jan's frequency is ------?
 
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