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Why are light sources with a 21cm wavelength useful to astronomers?
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How do scientists determine the chemical makeup of the stars?
Different chemicals emit and absorb light at various wavelengths. Astronomers can look at the wavelength of light coming from stars and determine which chemicals must be present.
How can astronomers detect structure in the suns chromosphere?
The structure of the chromosphere is studied primarily using filtergrams. Filtergrams are images of the sun taken through a filter that lets in a very narrow wavelength band of light, such as light emitted by the Hydrogen-alpha transition.
Why does blue light scatter more than red light?
blue light has shorter wavelength than the red light.scattering of light is more when wavelength is small.
Why is called as monocromatic source of light?
Mono chromatic light is emitted by a laser source or by a red Light Emitting Diode. These sources emit a single wavelength of light around 550 nanoMetres. White light from the sun for example is a mixture of many wavelengths mixed together from red to violet to form white light.
How are rainbows formed after raining?
Light travels in waves. The light's wavelength determines its perceived color. Short wavelength light, for example, appears blue, and long wavelength light appears red. Sunlight is composed of light of many wavelengths. In the range that we can see, this includes the colors of the rainbow. When light enters water it bends (refracts). The amount of bending depends on the wavelength of light. As a result, the light splits into its component colors.the water / fog in the air reflects the sunlight, causing the white light of the sun to divide and become a rainbow color in the sky
What is the unit that astronomers most often use to express the wavelength of light?
Speed of light
What are coherent sources and conditions for it?
Coherent sources are sources of light with a constant phase difference. The conditions for this are that there is a constant phase difference and that the light is of the same wavelength.
Which equipment is most useful when measuring wavelength?
In case of measuring the wavelength of light we use Spectrometer. You could also use an oscilloscope or a dedicated frequency counter.
Is it possible to coherence between light sources emitting light of different wavelengths?
I don't think so. Coherence is defined for light of a single wavelength.
Is it possible to have coherence between light sources emiting light of different wavelengths?
I don't think so. Coherence is defined for light of a single wavelength.
What is the formula for fringe width?
Fringe width (for dark and bright bands): D * wavelength / d where, D = distance between screen and coherent sources (metres), wavelength = wavelength of light used is experiment (nanometres), d = distance between the 2 coherent sources (millimetres).
How do scientists determine the chemical makeup of the stars?
Different chemicals emit and absorb light at various wavelengths. Astronomers can look at the wavelength of light coming from stars and determine which chemicals must be present.
Can an object vibrate at the wavelength of light?
No object can vibrate at the wavelength of light. wavelength of light depends on the intensity of light and electron movements.
Is all of the electricity used to light a light bulb useful light?
No. Part of the energy is wasted, mainly as heat.
Conditions for interference of light?
You mean conditions for getting sustained interference pattern with clarity. 1. Sources have to be monochromatic and coherent 2. Two sources have to be so close as far as possible 3. The screen is to be kept at far distance
What affects light with short wavelength more than light with long wavelength?
Scattering of light
What determine the color of a light wave?
Its wavelength (or frequency).
