explain what is Doppler effect in sound and state it any four application
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Answered by
24
Hey mate..
==========
What is Doppler effect ?
▪The Doppler effect is the apparent shift in wave frequency due to the movement of a wave source.
▪ The Doppler effect explains why we perceive a change in pitch of the sound of siren when we see an ambulance approaching towards us.
▪It also explains the presence of shock waves and sonic booms when observing a supersonic aircraft.
Applications of Doppler Effect
☆Sirens☆
☆Radar☆
☆Astronomy☆
☆Medical Imaging☆
☆Blood Flow☆
☆ Measurement Satellite☆
☆ Communication☆
☆Vibration Measurement☆
☆Developmental Biology☆
Hope it helps you ...
==========
What is Doppler effect ?
▪The Doppler effect is the apparent shift in wave frequency due to the movement of a wave source.
▪ The Doppler effect explains why we perceive a change in pitch of the sound of siren when we see an ambulance approaching towards us.
▪It also explains the presence of shock waves and sonic booms when observing a supersonic aircraft.
Applications of Doppler Effect
☆Sirens☆
☆Radar☆
☆Astronomy☆
☆Medical Imaging☆
☆Blood Flow☆
☆ Measurement Satellite☆
☆ Communication☆
☆Vibration Measurement☆
☆Developmental Biology☆
Hope it helps you ...
Answered by
8
You hear the high pitch of the siren of the approaching ambulance, and notice that its pitch drops suddenly as the ambulance passes you. That is called the Doppler effeet.....
Doppler Effect
When a vehicle with a siren passes you, a noticeable drop in the pitch of the sound of the siren will be observed as the vehicle passes. This is an example of the Doppler effect. An approaching source moves closer during period of the sound wave so the effective wavelength is shortened, giving a higher pitch since the velocity of the wave is unchanged. Similarly the pitch of a receding sound source will be lowered.
Doppler Wavelength Change
The speed of sound is determined by the medium in which it is traveling, and therefore is the same for a moving source. But the frequency and wavelength are changed. The wavelengths for a moving source are given by the relationships below. It is sometimes convenient to express the change in wavelength as a fraction of the source wavelength for a stationary source:
Doppler Effect Frequency Calculation
At temperature C = F
the sound speed in air is m/s.
If the source frequency is Hz
and the velocity of the source is m/s = mi/hr
then for an approaching source the frequency is Hz
and for a receding source the frequency is
or
Doppler Effect
Imagine this scene. You are standing beside a road and a police car with its siren turned on, drives by you. What do you notice about the sound? The siren’s sound isn’t so loud when it is at a distance, which then reaches a maximum when it is just beside you, diminishing again as it crosses and moves away from you.
Consider another instance. Two people A and B are standing on the road as shown below in the picture.
Which person do you think hears the sound of the revving engine with a greater magnitude? You know that its person A but why?
This is where we discuss the Doppler Effect or the Doppler Shift. To highlight this effect you should understand the difference between the two situations given below.
Situation 1: How are the pattern of waves formed when you suddenly jump into a pond?
Situation 2: How are the pattern of waves formed when you are walking in a pond?
The image given below highlights the difference of wave patterns in both the situations.
This difference is because the source of the waves in the second case moves. This is what the Doppler Effect is. It is named after the physicist Christian Doppler who proposed this in the 19th century. The Doppler effect is the change of frequency of a wave emitted as observed by an observer moving relative to the source. In this, the frequency received by the observer is higher during approach, identical when the relative positions are the same, and keeps lowering on recession of source. If both the source and observer are moving, the total Doppler Effect is calculated based on both these motions.
Applications of Doppler Effect
SirensRadarAstronomyMedical ImagingBlood Flow MeasurementSatellite CommunicationVibration MeasurementDevelopmental BiologyAudioVelocity Profile Measurement
. mark it as brainliest answer....please....
enjoy your day
Doppler Effect
When a vehicle with a siren passes you, a noticeable drop in the pitch of the sound of the siren will be observed as the vehicle passes. This is an example of the Doppler effect. An approaching source moves closer during period of the sound wave so the effective wavelength is shortened, giving a higher pitch since the velocity of the wave is unchanged. Similarly the pitch of a receding sound source will be lowered.
Doppler Wavelength Change
The speed of sound is determined by the medium in which it is traveling, and therefore is the same for a moving source. But the frequency and wavelength are changed. The wavelengths for a moving source are given by the relationships below. It is sometimes convenient to express the change in wavelength as a fraction of the source wavelength for a stationary source:
Doppler Effect Frequency Calculation
At temperature C = F
the sound speed in air is m/s.
If the source frequency is Hz
and the velocity of the source is m/s = mi/hr
then for an approaching source the frequency is Hz
and for a receding source the frequency is
or
Doppler Effect
Imagine this scene. You are standing beside a road and a police car with its siren turned on, drives by you. What do you notice about the sound? The siren’s sound isn’t so loud when it is at a distance, which then reaches a maximum when it is just beside you, diminishing again as it crosses and moves away from you.
Consider another instance. Two people A and B are standing on the road as shown below in the picture.
Which person do you think hears the sound of the revving engine with a greater magnitude? You know that its person A but why?
This is where we discuss the Doppler Effect or the Doppler Shift. To highlight this effect you should understand the difference between the two situations given below.
Situation 1: How are the pattern of waves formed when you suddenly jump into a pond?
Situation 2: How are the pattern of waves formed when you are walking in a pond?
The image given below highlights the difference of wave patterns in both the situations.
This difference is because the source of the waves in the second case moves. This is what the Doppler Effect is. It is named after the physicist Christian Doppler who proposed this in the 19th century. The Doppler effect is the change of frequency of a wave emitted as observed by an observer moving relative to the source. In this, the frequency received by the observer is higher during approach, identical when the relative positions are the same, and keeps lowering on recession of source. If both the source and observer are moving, the total Doppler Effect is calculated based on both these motions.
Applications of Doppler Effect
SirensRadarAstronomyMedical ImagingBlood Flow MeasurementSatellite CommunicationVibration MeasurementDevelopmental BiologyAudioVelocity Profile Measurement
. mark it as brainliest answer....please....
enjoy your day
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