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Frequency

What is the f...

Question

What is the frequency of car horn?

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Solution

A car horn has a frequency about 200-500 Hz

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Q. A police car horn emits a frequency 250Hz when it is at rest. What frequency does a stationary observer hear if the police car sounds its horn while approaching at a speed of

27 m s^{- 1}

? What frequency is heard if the horn sounded as the car is leaving at

27 m s^{- 1}

? Velocity of sound

= 340 m s^{- 1}

?

Q. A police car horn emits a frequency 250Hz when it is at rest. What frequency does a stationary observer hear if the police car sounds its horn while approaching at a speed of

27 m s^{- 1}

? What frequency is heard if the horn sounded as the car is leaving at

27 m s^{- 1}

? Velocity of sound

= 340 m s^{- 1}

?

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Q. A red car moving west on some road is creating a loud sound with a frequency of

700 H z

. A blue car is also travelling west along the same road. A person in the blue car hears the loud sound from the red car.
From the following list of frequencies, what possible frequency or frequencies might the person in the blue car hear?
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710 H z

700 H z

690 H z

Q. The horn of a car emits sound with a dominant frequency of 2400 Hz. What will be the apparent dominant frequency heard by a person standing on the road in front of the car if the car is approaching at 18.0 km h⁻¹? Speed of sound in air = 340 m s⁻¹.

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