Answer:
[tex]\frac{f_s}{f_l}=(1.05)[/tex]
Explanation:
Due to Doppler effect:
[tex]f_l=f_s(\frac{v-v_0}{v+v_0} )[/tex]
f_l= frequency experienced by the observer
f_s= frequency of the source
v= velocity of sound( 345 m/s)
v_0= velocity of observer ( speed of car = 8.49 m/s)
therefore, ratio of frequency is
[tex]\frac{f_l}{f_s}=(\frac{345-8.49}{345+8.49} )[/tex]
[tex]\frac{f_l}{f_s}=(\frac{336.51}{353.49})[/tex]
[tex]\frac{f_s}{f_l}=(\frac{353.49}{336.51})[/tex]
=1.05
