Question

what is the apparent frequency when the source and observer are same and are in motion ?
to understand this question better
when a car horns the sound hits the wall which is infront of the car and reflects back to the car what is the apparent frequency?​

Answer 1

Answer:

Note that if the observer and source are moving at the same speed in the same direction, no frequency change is detected. This type of change in frequency due to motion is called the Doppler effect. What happens if the source is not moving directly towards or away from the receiver