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Q.

We can hear the sound of the horn of an approaching car before the car reaches because:

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a

low pitch of the horn

b

speed of sound is greater than the car

c

high pitch of the horn

d

no obstacle is present

answer is B.

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Detailed Solution

Sound travels through the air at approximately 330 m/s, which is many times faster than the speed of a car. As a result of the relative speed, the horn sound of an approaching car is heard before the car. Because the velocity of sound is much greater than that of the fastest car, we can hear the sound of a horn before seeing the car.

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