A loudspeaker emits sound of frequency $f_s$. The loudspeaker is attached to a car that moves with increasing speed directly towards a stationary observer.
Which statement describes the frequency of the sound heard by the observer?
a frequency greater than $f_s$ and increasing
2 )
a frequency greater than $f_s$ but decreasing
3 )
a frequency less than $f_s$ and decreasing
4 )
a frequency less than $f_s$ but increasing
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