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Why do far away galaxies look red?
basically, according to the law of scattering light of longer wavelength scatters less hence, red light having the longest wavelength in the visible spectrum scatters less while all the other colors gets scattered
What is a redshift in a light spectra?
Redshift in a light spectrum refers to the increase in the wavelength of light compared to a stationary source. This increase occurs when an object is moving away from an observer, causing the light waves to stretch and shift towards the red end of the spectrum. Redshift helps astronomers determine the speed and distance of celestial objects in the universe.
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 matches with radiant heat on the electromagnetic spectrum?
Radiant heat corresponds to infrared radiation on the electromagnetic spectrum. This type of heat is emitted by warm objects and can be detected as heat by our skin or specialized sensors. Infrared radiation is commonly used in technologies like infrared heaters and thermal cameras.
What kind of spectrum do astronomers find most useful?
Astronomers find the electromagnetic spectrum most useful during their observations and research. This spectrum includes various types of radiation such as visible light, radio waves, X-rays, and gamma rays, which provide valuable information about the properties and behavior of celestial objects. By studying different wavelengths of light, astronomers can gain insights into the composition, temperature, and movement of objects in the universe.
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.
What According to the Doppler effect objects moving away from Earth would have a?
According to the Doppler effect, objects moving away from Earth would have a redshifted spectral line. This means that the wavelength of the light they emit would be stretched, causing it to shift towards the red end of the spectrum.
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.
What happened to the wavelength of infrared waves as the objects get hotter?
As objects get hotter, the wavelength of infrared waves they emit decreases. This is known as Wien's Displacement Law, which states that the peak wavelength of thermal radiation emitted by an object is inversely proportional to its temperature. So, as the temperature of an object increases, the peak wavelength of the emitted radiation shifts to shorter wavelengths in the infrared spectrum.
When the wavelength of spectral emitted from an objectincreases which end of the visiblelight spectrum does ti move toward and what is the objects motion relative to earth?
When the wavelength of spectral light emitted from an object increases, it moves towards the red end of the visible light spectrum, also known as the redshift. This indicates that the object is moving away from Earth.
What type of wavelength hot and cold objects have?
Hot objects emit shorter wavelengths, such as infrared radiation, while cold objects emit longer wavelengths like microwave radiation. This is known as blackbody radiation, where the temperature of an object determines the peak of its emitted spectrum.
When the wavelength of spectral lines emitted from an object decreases which end of the visible light spectrum does it move toward and what is the objects motion relative to earth?
When the wavelength of spectral lines emitted from an object decreases, it moves towards the violet end of the visible light spectrum. This is known as a blueshift, indicating that the object emitting the light is moving towards Earth.
How are temperature and wavelength of a glowing body related?
The temperature of a glowing body determines the peak wavelength of light emitted according to Wien's Law. As temperature increases, the peak wavelength decreases, meaning hotter objects emit more blue and cooler objects emit more red light.
What makes the color yellow?
The color yellow is created by a certain wavelength of light being reflected and absorbed by an object. Objects appear yellow when they reflect light in the wavelength range of approximately 570 to 590 nanometers on the visible light spectrum.
What is the wavelength of a heat lamp?
The wavelength of a heat lamp typically falls within the infrared spectrum, ranging from about 780 nanometers to 1 millimeter. These longer wavelengths are effective for generating heat because they are absorbed by objects, causing their molecules to vibrate and produce heat.
