A person riding on a bus hears the sound from a horn on a car that is stopped. What is different about the sound when the bus is approaching the car compared to when the bus is moving away from the car?

1- Observed frequency increases when moving towards the car

2-Observed frequency decreases when moving away from the car

Explanation:

When bus moving towards the car;

Let,

f= frequency observed by the person

c= propagation speed of waves in air

Vr= velocity of person

= frequency of emission of waves by the car

The transmission velocity of waves will change;

i-e observed frequency increases

When bus moving away from the car;

The transmission velocity of waves will change as;

i-e observed frequency decreases

the answer is d

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