Joe, standing near a straight road, records the sound of the horn of a car trave
ID: 1403849 • Letter: J
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 T is ..... that in S.
The distance of Joe from the path in Q is ..... in R.
The speed in trial Q is ..... to that in R.
The speed in trial U 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 S is ..... that in other trials.
Using the data on the figure, calculate the speed of the car in trial U. Use 340 m/s for the speed of sound.
1050 1000 950 900 850 O 800 5 -100 -50 50 100 Position, (m)Explanation / Answer
The speed in trial T is Greater than that in S.
The distance of Joe from the path in Q is Less than that in R.
The speed in trial Q is Equal to that in R.
The speed in trial U is Highest that in other trials.
When the car is far away, the average of the frequencies moving in and out is Equals the frequency at rest.
The speed in trial S is Lowest that in other trials
Reason for the above -
1.) Higher the velocity the greater the frequency shift.
2.) For Q and R are Travelling at the same Speed as we can see they converge at the same point at -100 and 100 but the way they diverge shows, Q is more closer to path than R.
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