Question

You are about 8 m away from the elevator in a hospital carpark. As you are...

You are about 8 m away from the elevator in a hospital carpark. As you are walking towards the elevator, the alarm in a car that is parked close to the elevator area sets off. Explain if there will be any change in the frequency of the sound of the alarm as you move closer to the affected car from your original position.

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Answer #1

The original frequency of the alarm is unchanged. But the apparent frequency fo heard by the person, as he closes in on the car, is different from the original frequency f, where apparent frequency is given by

where, v = speed of sound and, u = speed of person

and from the equation we can see than the apparent frequency heard by the person is larger than the original frequency.

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