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What would the frequency be if an observer noticed 6 waves in 2 seconds?
6 waves/2 seconds = 3 waves per second = 3 Hz.
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 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.
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.
When does an observer at a railroad crossing hear the lowest frequency of a trains whistle?
An observer at a railroad crossing hears the lowest frequency of a train's whistle when the train is approaching. As the train moves towards the observer, the sound waves are compressed, resulting in a higher perceived frequency.
What is the observed change in the frequency of a wave when either the source or observer is moving?
When either the source or the observer is moving, there is a change in the frequency of the wave observed, known as the Doppler effect. If the source is moving towards the observer, the frequency appears higher (blueshift); if the source is moving away, the frequency appears lower (redshift). The same principle applies if the observer is moving instead of the source.
HOW is it produce of Doppler effect?
If you have a source that emits a wave and an observer that is motionless with respect to the source, no Doppler Effect is noticed. If the source and observer move with relation to each other then the wave appears distorted (compressed if the motion is towards each other, distended if the motion is away from each other). Say we have a source of sound by the side of the road (a repeatedly clanging bell). If an observer moves towards it, the sound waves appear to meet the observer sooner and the pitch of the bell (and frequency of the clanging) increase. After passing the bell and while moving away, the frequency of the clanging and the frequency of the sound drop.
Frequency of a wave?
The frequency of a wave is the amount of cycles that pass the observer in any time.
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.
The apparent change in the frequency of a sound emitted by a moving object as it passes a stationary abserver?
The apparent change in the frequency of a sound emitted by a moving object as it passes a stationary observer is called the Doppler effect. As the object moves towards the observer, the observer perceives a higher frequency (higher pitch) than what is actually emitted. Conversely, as the object moves away from the observer, the perceived frequency is lower than the actual frequency emitted.
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.
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.
