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How does the frequency measured in front of the source appear to the observer compared to the frequency measured from behind?
The frequencies are the same, unless the source is moving relative to the observer.
If light always travels at the same speed how can its color shift to red due to the Doppler effect?
As you mention light speed is constant. Light speed equals to its wavelength times its frequency. c = lambda * freq As the light source travels toward the observer, in such high speeds comparable to the light speed relative to the observer, the later emitted light waves pile up behind the earlier emitted light waves as they all travel together toward the observer, causing a visible shift (higher) in the frequency of the received waves as seen by the observer.
The change in the Doppler effect causes what not to occur with it?
The change in the Doppler effect does not cause a change in the frequency of the wave source itself; it only affects how the frequency of the wave is perceived by an observer in relative motion to the source.
When the speed of light changes the frequencywavelegnth changes?
The constancy of the speed of light in vacuum is the keystone of relativity. Because of this, the frequency/wavelenth of the light changes relative to the observer when the source is approaching or receding from the observer. That's why there is red shift. Usually, this is explained by analogy to the Doppler effect with sound waves, where the speed of sound is constant and the frequency has to changes as the relative motion changes.
What three things affect the frequency of a sound wave?
The three things that affect the frequency of a sound wave are the source of the sound (vibration frequency), the medium through which the sound wave is traveling (speed of sound in the medium), and the relative motion between the source of the sound and the observer (Doppler effect).
From the perspective of a stationary observer, does time for an object in motion relative to the observer"?
Yes, time for an object in motion relative to a stationary observer appears to pass slower.
Why does observer measure waves from an approaching source as having a higher frequency than if the source were standing?
This is due to the Doppler effect, where the motion of the source compresses the waves as it approaches the observer. This compression increases the frequency perceived by the observer. If the source were stationary, there would be no relative motion and no frequency shift.
When For a stationary observer when the source of a sound is moving it is?
C.pitch appears to change -apex
After an approaching ambulance passes a stationary observer what does the frequency of the sound of the siren heard by the observer appear to do?
The frequency of the sound of the siren appears to decrease as the ambulance moves away from the observer. This is due to the Doppler effect, which causes a shift in frequency as the source of the sound moves relative to the observer.
How does the relative motion of a motorcycle affect the frequency of the sound heard by an observer on the sidewak?
as the motorcycle approaches the observer, the frequency increases.
What is the apparent change in frequency of a sound emitted by a moving object as it passes a stationarybobserver called?
The apparent change in frequency of a sound emitted by a moving object as it passes a stationary observer is called the Doppler effect. This effect causes the perceived frequency of the sound to change depending on the relative motion of the source and the observer – it is higher as the source approaches the observer and lower as it moves away.
What is the stationary point that used for speed measurement?
There is really no such thing as an absolute stationary point. By convention one can be picked as any point in the observer's frame of reference (i.e. any point stationary relative to the observer).
What is a phenomenon that depends on the relative motion of the source and the observer?
The Doppler effect is a phenomenon that depends on the relative motion of the source and the observer. It is the change in frequency or wavelength of a wave in relation to an observer moving relative to the source of the wave.
How does the frequency measured in front of the source appear to the observer compared to the frequency measured from behind?
The frequencies are the same, unless the source is moving relative to the observer.
Does the frequency change if the observer moves?
Yes, the frequency of a wave changes if the observer is moving relative to the source of the wave. This is described by the Doppler effect, where the frequency appears higher if the observer is moving towards the source, and lower if the observer is moving away from the source.
How does the relative motion between the source of a wave and an observer effect the observation of the wave?
The relative motion between the source of a wave and an observer can affect the observed frequency and wavelength of the wave. If the source and observer are moving towards each other, the observer will perceive a higher frequency and shorter wavelength (Doppler effect). If they are moving away from each other, the observer will perceive a lower frequency and longer wavelength.
Would there be a Doppler effect if the source of sound were stationary and the listener in motion?
Yes, there would still be a Doppler effect in this scenario. The observer's motion relative to the medium through which sound travels causes a change in the frequency of the perceived sound, even if the source is stationary.
