Joe, standing near a straight road, records the sound of the horn of a car trave

Question

Joe, standing near a straight road, records the sound of the horn of a car traveling at a constant speed. The recorded frequency as a function of the car's position along the road for trials at different car speeds is accurately graphed below. The speed in trial Q is .... that in other trials. When the car is far away, the average of the frequencies moving in and out is ... the frequency at rest. The speed in trial T is .... to that in R. The speed in trial U is .... that in T. The speed in trial S is .... that in other trials. The distance of Joe from the path in R is .... in T. Using the data on the figure, calculate the speed of the car in trial Q. Use 340 m/s for the speed of sound.

Explanation / Answer

Speed in the trail Q is more than that in other trials as trial Q has highest frequency difference.

When the car is far away , the average of the frequencies moving in and out is equal to the frequency at rest.

The speed in the trial T is equal to that in R.

The speed in the trial U is more than that in T.

Speed in the trail S is less than that in other trials as trial s has lowest frequency difference.

The distance of Joe from the path in R is more than that in T, as slope of R near the observer is less than T

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