A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn

70.07 Hz

Explanation:

Since the sound is moving away from the observer then

and when moving towards observer

With of 76 then taking speed in air as 343 m/s we have

Similarly, with of 65 we have

Now

v_s=27.76 m/s

Substituting the above into  any of the first two equations then we obtain

as technology advances, new experiments often expose problems in accepted theories. c

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-lavira: )

temp rises, and expansion