A) Sonic boom
B) Echo
C) Sound barrier
D) Doppler effect
Correct Answer: D
Solution :
As we can see in the figure, when the car is stationary, the sound pitch is equal in both directions. However, as the car starts moving towards us the sound pitch will be higher. The sound the car is producing is not changing. Its frequency is the same. However, as the car is travelling towards you the speed of the car is causing the sound waves to hit your ear faster or at a higher frequency than the car is making them. Once the car passes you, the sound waves are actually reaching your ear at a lower frequency.
You need to login to perform this action.
You will be redirected in
3 sec
