Car 1 moves toward car 2 with speed v. An observer in car 2 measures the frequen

Question

Car 1 moves toward car 2 with speed v. An observer in car 2 measures the frequency of the sound emitted by car 1?s horn to be f. Now ,car 1 remains stationary while car 2 moves toward car 1 with speed v. The observer in car 2 now measures the frequency of car 1?s horn to be f. The relationship between the observed frequencies is A)f f. Two cars are travelling in the same direction and with the same speed along a straight highway . Does either driver hear a different frequency from the other car?s horn than they would if the cars were stationary? A)Yes, they both experience a Doppler shift. B)Only the driver of the front car experiences a Doppler shift. C)Only the driver of the rear car experiences a Doppler shift. D)No, because neither driver experiences a Doppler shift. E)It is impossible to predict.

Explanation / Answer

Q. 6) Ans. B

reason- as doppler effect depends only in the relative velocity between the two objects and here in both the cases the relative velocity between those cars is v, therefore in both the cases frequency will be same.

Q. 7) Ans.D

reason- as doppler effect depends only in the relative velocity between the two objects and here in both the cases the relative velocity between those cars is zero. therefore their will be no doppler effect.

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