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With the observer stationary, as an object emitting light moves away, each wave is emitted from a point farther away than the preceding wave and thus takes longer to reach the observer. Because of this Doppler effect (Proposed by Austrian Christian Doppler in 1849) the perceived wavelength is lengthened and therefore (in the visible spectrum) it appears at a lower frequency and is called a red shift (the lowest visible frequency being red). If the object moves in the opposite direction (towards the observer), each wave is emitted from a point closer to the observer than the preceding wave so the wavelength seems shorter and the frequency appears higher and moves towards that end of the spectrum. Although the highest visible frequency is violet, someone somewhere decided to call this Doppler effect the blue shift.
What else can I help you with?
What direction does a shadow move?
A shadow moves in the opposite direction of the light source that is causing it. As the position of the light changes, the shadow will shift accordingly.
What is the direction of a shadow?
A shadow is formed in the opposite direction of the light source. For example, when the light source is behind an object, the shadow is cast in front of the object.
Why is shadow of an object formed in direction opposite to the light source?
The shadow of an object is formed in the direction opposite to the light source because the light rays that illuminate the object cannot pass through it, creating an area of darkness behind the object where these rays are blocked. This results in the shadow being cast in the direction away from the light source.
What happens to the direction of light in which it travels during reflection?
During reflection, the direction of light reverses. If light was traveling towards a reflective surface at a certain angle, it will bounce off the surface at an equal angle but in the opposite direction.
When light Shines on an object in which direction is shadow formed?
The shadow is cast on the opposite side of the object that the light source(s) is coming from. By the way im not too good with this kind of stuff.
What wil happen when light is shone at a mirror?
it will shine bak x
Can reflection of light happen without changing the direction of light?
No, reflection means that the direction of light is changed.
What is the redshift star?
Redshift of a star refers to the phenomenon where the light emitted by the star is shifted towards the red end of the electromagnetic spectrum due to the star moving away from us. This shift is caused by the Doppler effect and is commonly used to determine the speed and direction of a star's movement.
In astrophysics terms when does redshift happen?
In astrophysical terms, redshift occurs when light or electromagnetic radiation increases in wavelength and shift to the red end of the spectrum. In other words colors seem more red than they are.
What direction does a shadow move?
A shadow moves in the opposite direction of the light source that is causing it. As the position of the light changes, the shadow will shift accordingly.
The cosmological redshift is a direct measure of the expansion of the universe thus independent of direction?
Actually, no on both counts. The redshift is a DIRECT measure of the fact that distant objects are moving away from us. It IMPLIES the expansion of the universe, but doesn't directly measure it. Also, even if it were, it wouldn't necessarily be independent of direction. One recent study indicates that it might not be, which (if true) means the Universe is not expanding isotropically.
A decrease frequency of light from a galaxy would make the galaxy appear redder?
Yes, this is due to the redshift effect in cosmology where the wavelength of light from distant galaxies is stretched as the universe expands, causing the light to appear redder. This redshift is proportional to the distance of the galaxy, helping astronomers estimate how far away it is.
What is the direction of a shadow?
A shadow is formed in the opposite direction of the light source. For example, when the light source is behind an object, the shadow is cast in front of the object.
Can refraction of light happen without changing the direction of light?
no. Energy is conserved.
Why do we have shadow?
Shadows are caused when an object is blocking the light causing the shape to appear on the ground in the opposite direction of the source of the light. A shadow only appears in the light or when any shining object faces them. All objects in the way of the light will appear with a shadow in the opposite direction of the source of the light.
Why is shadow of an object formed in direction opposite to the light source?
The shadow of an object is formed in the direction opposite to the light source because the light rays that illuminate the object cannot pass through it, creating an area of darkness behind the object where these rays are blocked. This results in the shadow being cast in the direction away from the light source.
What happens to the direction of light in which it travels during reflection?
During reflection, the direction of light reverses. If light was traveling towards a reflective surface at a certain angle, it will bounce off the surface at an equal angle but in the opposite direction.
