An ambulance emits a frequency of 450 Hz from its siren. What frequency is heard by a man as the ambulance moves toward him?

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24-03-2017
Physics

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An ambulance emits a frequency of 450 Hz from its siren. What frequency is heard by a man as the ambulance moves toward him?

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Thomas815 Thomas815 · Answer 1 · 2017-03-24T15:42:49+01:00

Thomas815 Thomas815

24-03-2017

Is there more information like the ambulances speed? The frequency would be higher than 450 hz though

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RomeliaThurston RomeliaThurston · Answer 2 · 2019-01-22T07:42:53+01:00

Answer: Frequency will be greater than 450Hz.

Explanation:

Frequency is defined as the number of oscillations of wave happening in 1 second.

[tex]\text{Frequency}\propto \frac{1}{\text{Time period}}[/tex]

More the time period, less will be the frequency and vice-versa.

In the given question, an ambulance is emitting a frequency of 450 Hz as ambulance move towards a man.

When ambulance is coming near to the man, time required for the ambulance to reach man is decreasing and as we know, frequency is inversely related to time period. Therefore, frequency greater than 450 Hz will be heard by the man.