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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?
Wiki User
∙ 10y ago
The frequencies are the same, unless the source
is moving relative to the observer.
Wiki User
∙ 10y ago
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Why doesn't the Doppler shift appear when an observer moves toward the source?
Doppler's effect does not happen when the observer is moving towards the source because unlike the source when observer moves forward the waves are not compressed and they pass the observer without being compressed and since the doppler effect is due to the Change in wavelength of the wave, it fails to occur.
To an observer on a ship at sea at which latitude does north star appear closest to the horizon?
5 DEGREES
What rises in the east and sets in the west for an observer in New York?
Most natural celestial objects do this; exceptions would be any fixed star that is 'circumpolar'-- they are close enough to the celestial poles that they never appear to dip below the observer's horizon. Which stars are circumpolar depends on the latitude of the observer.
How is a lunar and solar eclipse alike?
Both lunar and solar eclipses are the result of positioning 3 astronomical bodies (earth, sun and moon) in a straight line relative to the observer. A solar eclipse is observed when the sun, moon, and earth are positioned in a straight line with an observer on the earth. A lunar eclipse is observed when the sun, earth, and moon are in a straight line with an observer on the earth. A lunar eclipse, as observed by an observer on the earth would appear as a solar eclipse as observed by an observer on the moon.
Why do pulsars appear to flash on and off?
Because they spin. The radiation is directional and sweeps across the universe. A relatively stationary observer sees the pulsar as an off/on phenomenon.
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?
Soften... It is lower due to the Doppler effect. Decrease =]
What causes a red shift?
When a light source is receding away from an observer then due to Doppler effect the frequency would appear to fall. Hence the colour would be shifted towards the red end. Hence red shift Same way as the source is apporaching the observer, then frequency would appear to increase and so it moves towards violet. Hence violet shift.
Whenever a source of sound moves the frequency heard by the observer is Less than that of the source?
To be more specific, a sound source moving toward you will appear to emit a sound of higher frequency than actual. Conversely, a sound source moving away from you will appear to emit a sound of lower frequency than actual. See "the Doppler effect."
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.
When a star or galaxy moves quickly toward an observer the light it emits will appear?
It will be "blue-shifted". That is, the wavelength of the light will appear to be shorter and so more blue.
How can two different observers measure a different speed for the same object?
It depends on the observer's frame of reference. If both are stationary then an object's speed will be measured to be the same. If one or both are moving at unequal velocities, then the same object will appear to move at a different speed for each observer.
Where would Polaris appear to an observer at the equator?
On the horizon
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 would the moon appear to an observer on earth if the moon did not rotate?
it would still appear to rotate
What is the point to an observer the earth and sky appear to meet?
The horizon.
How does the moon appear to an observer on earth during a full moon?
Full, large or whole. Maybe the question was meant to be...How would the Earth appear to an observer on the moon during a full moon?
Why doesn't the Doppler shift appear when an observer moves toward the source?
Doppler's effect does not happen when the observer is moving towards the source because unlike the source when observer moves forward the waves are not compressed and they pass the observer without being compressed and since the doppler effect is due to the Change in wavelength of the wave, it fails to occur.
