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What is a device that separates the light from stars and other objects according to wavelength in order to produce a spectrum?
Wiki User
∙ 12y ago
spectrograph
Wiki User
∙ 12y ago
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Why do you see objects and their color?
You see objects because visible light( a small portion of the electromagnetic spectrum) is reflected off the surface of something into your eye. All different colors have a different wavelength which defines their frequency. When you see a red object, that object is absorbing all the colors except for red which is then reflected into your eye.
What are 2 discoveries that Edwin Hubble made which changed astronomy?
Edwin Hubble demonstrated that The Milky Way (our galaxy) is not the only galaxy that exists, but that there are many more galaxies in the universe. Also, he examined the wavelength of light coming from various galaxies, and determined that the further away it was, the greater the shift of wavelength into the red end of the spectrum. This is called 'Hubble's Law' and meant that the whole universe was expanding and not just that objects were moving within it.
What kind of spectrum do astronomers find most useful?
The continuous spectrum is extremely important to astronomers. Objects as well as gasses can be located by the direct wavelengths that are presented at any time.
Are red objects on space all hot?
No. Often the red colour in space is caused by something called red shift, whereby objects moving away from our planet/solar system look red as the light waves move to the red end of the light spectrum.
Why is it useful to to examine the universe using parts of the electromagnetic spectrum other than visible light?
Because many stars emit energy unevenly over the electromagnetic spectrum. Thus extremely energetic objects would be brighter in X-rays (more energetic than visual light) and some brown dwarfs would be easier to perceive in the infrared. Combining images from across the spectrum avoids the three blind men and the elephant issue.
What is important about the peak wavelength of a thermal radiation spectrum?
The peak wavelength, is connected to the temperature of the objects. we have short peak wavelength when the temperature is high.
How does a radio telescope see objects which are too dim for an ordinary telescope?
Radio Telescope observe light of a different wavelength then optical light. Radio waves have a longer wavelength then visible light. Some interstellar objects barley emit any light in the visible spectrum but emit a significant amount of radiation in the radio spectrum. Radio telescopes enable us to view objects which emit in the radio spectrum.
Why do astronomers use frequency?
Frequency or wavelength is used in the spectrum of astronomical objects in order to identify which chemical elements are present in the stars.
When the wavelength of a spectral line emitted from an object increases which end of the visible light spectrum does not move toward and what is the objects motion relative to earth?
Increasing wavelength is an indication of a Doppler shift caused by an object moving away from the viewer. Longer wavelengths (of the visible spectrum) are redder, shorter wavelengths are bluer. Objects moving away from you have a red shift, objects moving toward you have a blue shift.
Do hotter objects emit photons with a shorter wavelength?
Yes, according to the laws of thermal radiation.
Part of the electromagnetic spectrum makes the sidewalk feel warm on a sunny day?
The sun emits all of the electromagnetic spectrum. The part that heats the sidewalk is the infrared region which is invisible and has a long wavelength. Dark objects absorb much more heat than lighter objects so that asphalt pavement will get much hotter than concrete.
What will happen to an objects wavelength as the object moves toward you?
The wavelength will be compressed/shortened.
What are differences in colors of moving objects in space that are approaching and moving objects that are moving away?
Objects moving toward you will have a blue shift in their spectrum and objects moving away from you will have a red shift in their spectrum. This is known as a doppler shift.
How does sound travel through solid objects?
Sound is a longitudinal wavelength that has wavelength, velocity, frequency and amplitude. It travels through solid objects by going through vibration.
Is light a combination of all the colors in the rainbow?
White light, like from the sun is composed of the electromagnetic spectrum, not all of the spectrum passes through the atmosphere. visible light is made of a small section of the spectrum (wavelength of 400-700nm) and that is comprised of colours such as what are seen in the rainbow. when you see a colour with your eyes, the object reflecting that colour is absorbing all of the other colours, whit objects reflect everything, and black objects reflect nothing, all the other colours are combinations.
What will happen to an objects spectrum as the object moves away from you?
the spectrum change with direction, either from you or away
Why do you see objects and their color?
You see objects because visible light( a small portion of the electromagnetic spectrum) is reflected off the surface of something into your eye. All different colors have a different wavelength which defines their frequency. When you see a red object, that object is absorbing all the colors except for red which is then reflected into your eye.
