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What is the observed change in the frequency of a wave when either the source or observer is moving?
Wiki User
∙ 13y ago
Doppler shift
Wiki User
∙ 13y ago
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How does the amplitude change as the frequency increases?
There's no connection between amplitude and frequency. Either one can change, and often does, with absolutely no effect on the other.
How does changing the amplitude change the frequency?
There's no connection between amplitude and frequency. Either one can change, and often does, with absolutely no effect on the other.
Can anyone give definition for Doppler frequency?
It is not Doppler frequency. It's Doppler effect. The APPARENT change in the frequency of the source as there is a relative motion between the source and the observer is defined as Doppler effect. The expression for frequency (apparent) is given fapparent = [(C - Vo + Vm)/(C-Vs+Vm)] x freal The condition to be kept in mind is that the source is on the left side and the observer on the right side along positive X axis. Vm - velocity of the medium and the medium is moving along positive X axis. Vo - the velocity of the observer Vs - the velocity of the source C - velocity of the wave either sound or light But in case of light Vm is not needed as the medium movement will not affect the velocity of the wave in any way.
Describe the Doppler effect?
VROOOOOOOMMMM! The change in pitch when a car speeds by, first higher (when approaching) then lower (when receding).The Doppler effect is the term we give to the apparent change in frequency of waves (often light or sound waves) as the distance between the source and the observer changes. If either the source or the observer of a wave is moving so that the effect is that they are getting farther apart or closer together, the Doppler effect will appear. Let's look more closely.If the distance between the observer and the source of a wave is decreasing because they are closing in on each other, something happens. The wave, which is normally characterized by a given frequency and an associated wavelength, will appear to increase in frequency (and decrease in wavelength). Let's get even closer and break it down a bit to see what happens.When a wave reaches at an observer, it has a given wavelength. If there is no change in the distance between that observer and the source that wavelength remains constant. But if the distance of separation is decreasing (say if the sensor - observer - moves towards the source 8motion is relative so it does not matter which of the source or sensor moves relative to any frame of reference), as the crests and troughs of the wave arrive the observer will be (apparently) "running towards the next peak or trough" of the wave. This makes the wave appear to have a shorter wavelength. The observer is "running to intercept" the oncoming wave and the next crest or trough will "arrive sooner" because of the relative motion. This gives the effect of a change of frequency of the wave, and it makes it appear higher in frequency (with an accompanying shorter wavelength).If there is no change in distance between the source and the observer, the wave has a given wavelength. When a crest of the wave arrives at the observer's position, it takes "x" amount of time for the next crest to arrive. That's the period of the wave, or the time it takes for one complete cycle of the wave to occur. If the source and/or observer are/is moving relative to one another and the distance is closing, the "next crest" will "arrive sooner" and the period of the wave is effectively reduced. A shorter period of a wave equates to a higher frequency and a shorter wavelength. As the distance between the observer and the source opens, the opposite effect can be seen. Doppler effect isn't too tough to get a handle on if you work with it and think it through.If you've ever stood beside a roadway (or railroad track) with a vehicle (or train) coming toward you at speed, it has a given pitch (frequency). As it passes and moves away, the pitch (frequency) goes down. Simple and easy to observe. In astronomy, we note that the colors of stars in very distant galaxies are "wrong" as we observe them, but by "shifting the frequency" to increase it, they take on their "correct" colors. (*We know the "correct" colors due to the obvious pattern of spectral lines which the elements in a star have. The distant galaxies are moving away from us, and the light they emit is lower in frequency as we observe it than it would be if we were not moving apart. That light has been shifted toward the lower end of the optical spectrum, which is toward the red end. This is red shift, or the so-called redshift (one word) you hear about in astrophysics.Need a link for more information? Look below and you'll find some.When pitch rises as sound approackes then drops as the source passes by example: sirens
Is wavelength and frequency vary inversly?
The speed at which a wave propagates is the product of its wavelength and its frequency. The wavelength and the frequency vary inversely because the speed of a certain type of wave in a certain type of medium under certain conditions is constant.
An object has natural green color What should be its color when it is viewed from inside water such that the object is in air and the observer is inside water?
The frequency of the incident light will not change, therefore, the colour will not change either. However, the object will appear closer to the observer since the index of refraction of air is less than that of the water.
How does the amplitude change as the frequency increases?
There's no connection between amplitude and frequency. Either one can change, and often does, with absolutely no effect on the other.
How does changing the amplitude change the frequency?
There's no connection between amplitude and frequency. Either one can change, and often does, with absolutely no effect on the other.
Can anyone give definition for Doppler frequency?
It is not Doppler frequency. It's Doppler effect. The APPARENT change in the frequency of the source as there is a relative motion between the source and the observer is defined as Doppler effect. The expression for frequency (apparent) is given fapparent = [(C - Vo + Vm)/(C-Vs+Vm)] x freal The condition to be kept in mind is that the source is on the left side and the observer on the right side along positive X axis. Vm - velocity of the medium and the medium is moving along positive X axis. Vo - the velocity of the observer Vs - the velocity of the source C - velocity of the wave either sound or light But in case of light Vm is not needed as the medium movement will not affect the velocity of the wave in any way.
Describe the Doppler effect?
VROOOOOOOMMMM! The change in pitch when a car speeds by, first higher (when approaching) then lower (when receding).The Doppler effect is the term we give to the apparent change in frequency of waves (often light or sound waves) as the distance between the source and the observer changes. If either the source or the observer of a wave is moving so that the effect is that they are getting farther apart or closer together, the Doppler effect will appear. Let's look more closely.If the distance between the observer and the source of a wave is decreasing because they are closing in on each other, something happens. The wave, which is normally characterized by a given frequency and an associated wavelength, will appear to increase in frequency (and decrease in wavelength). Let's get even closer and break it down a bit to see what happens.When a wave reaches at an observer, it has a given wavelength. If there is no change in the distance between that observer and the source that wavelength remains constant. But if the distance of separation is decreasing (say if the sensor - observer - moves towards the source 8motion is relative so it does not matter which of the source or sensor moves relative to any frame of reference), as the crests and troughs of the wave arrive the observer will be (apparently) "running towards the next peak or trough" of the wave. This makes the wave appear to have a shorter wavelength. The observer is "running to intercept" the oncoming wave and the next crest or trough will "arrive sooner" because of the relative motion. This gives the effect of a change of frequency of the wave, and it makes it appear higher in frequency (with an accompanying shorter wavelength).If there is no change in distance between the source and the observer, the wave has a given wavelength. When a crest of the wave arrives at the observer's position, it takes "x" amount of time for the next crest to arrive. That's the period of the wave, or the time it takes for one complete cycle of the wave to occur. If the source and/or observer are/is moving relative to one another and the distance is closing, the "next crest" will "arrive sooner" and the period of the wave is effectively reduced. A shorter period of a wave equates to a higher frequency and a shorter wavelength. As the distance between the observer and the source opens, the opposite effect can be seen. Doppler effect isn't too tough to get a handle on if you work with it and think it through.If you've ever stood beside a roadway (or railroad track) with a vehicle (or train) coming toward you at speed, it has a given pitch (frequency). As it passes and moves away, the pitch (frequency) goes down. Simple and easy to observe. In astronomy, we note that the colors of stars in very distant galaxies are "wrong" as we observe them, but by "shifting the frequency" to increase it, they take on their "correct" colors. (*We know the "correct" colors due to the obvious pattern of spectral lines which the elements in a star have. The distant galaxies are moving away from us, and the light they emit is lower in frequency as we observe it than it would be if we were not moving apart. That light has been shifted toward the lower end of the optical spectrum, which is toward the red end. This is red shift, or the so-called redshift (one word) you hear about in astrophysics.Need a link for more information? Look below and you'll find some.When pitch rises as sound approackes then drops as the source passes by example: sirens
What is the predicate adjective in The silk flowers looked real to the casual observer?
Either the silk in silk flowers or the casual in casual observer.
How do you change AC motor speed?
A change in frequency of the motor will cause a change in the speed of the AC conveyor motor. This frequency change is brought about by a device called a Variable Frequency Drive. It is used to vary the frequency of the motor from 0 to 100%. I have no idea what the second answer is talking about. ANSWER: considering that no mention of type of motor is involved the frequency change theory is quite invalid since 50 or 60 Hz AC line runs clocks from banks to wake up calls and while it is true that the frequency is not accurate from second to second it is however very accurate from minutes to minutes.
The function of a capacitor in a elecircuit is to?
a capacitor have a property it oppose any change of voltage
What properties can be observed during a chemical reaction?
Some indicators of a chemical reaction are:- change of color- change of odor- release of a gas- change of the temperature- change of the viscosity- formation of a precipitate- change of general appearance- possible explosion- possible chemiluminescence -formation of new compounds
How could you measure the ripple frequency?
With either a digital frequency meter or an oscilloscope.
Frequency depends on voltage or current?
Frequency doesn't depend on either voltage or current.
What is pitch in terms of sound?
Either frequency or wavelength.
