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Visible Light Spectrum
Join us here to ask and answer questions on the "illuminating" topic of the visible light spectrum. This includes questions about: refraction, reflection, rainbows, prisms, mixing colored lights, and the spectrum of colors that make up white light.
1,220 Questions
How does blue light compare with ultraviolet light?
The blue light has longer wavelength, lower frequency, and
less energy per photon than the ultraviolet light has.
The blue light is also visible to the human eyes, whereas the
ultraviolet light is not.
Is there an upper limit to magnification using visible light?
Yes, the wavelength of the light limits the maximum magnification of a microscope. Using visible light, the limit is about 1200 to 1500X.
Are there photocells that are sensitive to laser light only?
No. Light is light.
A:
It's the wavelength that photodiodes are sensitive too. Specs vary widely, so photo emmitters have to be matched with photodiodes, or they won't 'see the light' This comes in handy when using your IR remote on a fairly bright day. If your TV could see all light, it would be blinded.
What acronym helps remember the spectrum of colors from longest to shortest wavelengths?
ROYGBIV
Red
Orange
Yellow
Green
Blue
indigo
Violet
What gives off light and produces it in space?
Stars are the only objects in space that give off their own light.
Other objects are visible only if a star shines on them.
The photon doesn't have a figure one can relate to. We can't say a photon looks like this -- or like that, because there's nothing in the world we see with our eyes day by day that looks like a photon.
Early bulbs were made of glass, blown into a bulb shape, using techniques already common in making glass drinking vessels and ornaments.
The filment is inserted at the open end and the glass re-heated to form a seal.
The air is drawn out using a suction pump, either attached at the same free end or through the opposite end via a tube. The glass being re-melted to keep a vucuum inside the bulb.
Early experiments in making the bulb, made bulbs in the form of a football, with a point at both ends, where the air has been drawn out.
It is important to remove the air, to stop the oxygen burning up the filament as it glows white hot. Modern bulbs replace the air with an inert gas, which does the same job.
Which light interaction explains what is happening to the bottom of the light beam?
Fiendship Happens when spongebob loves tacos
The electromagnetic spectrum
What type of energy does an element need to absorb to emit light?
Many different types of energy can do this.
Heat will cause anything to emit blackbody radiation and if there is enough heat the blackbody radiation will overlap the visible light spectrum and the object will be incandescent.
To emit light as a narrow spectral line requires raising electrons in the element to higher energy orbitals and allowing them to fall back, emitting photons. The type of energy that can do this can be of many sorts: light, chemical, electrical, etc.
What are the six colors of visible lights?
red, orange, yellow, green, blue, and violet. There are no other visible colors of light. Indigo, peacock blue, teal, kelly green, aqua, auburn, beige, brown, burgundy, coral, cyan, lilac, magenta, peach, pink, emerald, gold, gray, jade, lemon, olive, mahogany, maroon, mustard, orange, orchid, pink, plum, purple, rose, ruby, silver, tan, mauve, and ochre do not exist. Neither do most of the other hundreds of colors of paint and fabric that they want you to buy. They're all combinations of the basic colours.
What is the visible light region?
For a normal human being, visible light comprises electromagnetic radiation with wavelength in the range in the 390 nanometres (frequency = 770 THz) to 700 nm (430 THz).
How is visible light used to transmit phone calls along optical fibers?
A light emitting diode (LED) is used to shine into one end of the 'glass thread', and
a light detector is used to look for it at the other end of the thread. If the detector
can tell when the LED is shining (ON) and when it's dark (OFF), that's all it takes to
send information in the form of binary numbers from one end to the other. Anything
that can be coded in the form of binary numbers ... usually called "data" ... can be
sent through the fibre. It doesn't matter whether it's a telephone voice, a symphony,
a list of bank account balances, a TV picture with sound, a credit card transaction,
a movie, a book, a text message, a mobile app, or the front page of a newspaper.
What is the japanese word for light?
Light as in opposition to darkness would be 光 /hi ka ri/. If you mean light as against heavy, 軽い /ka rui/ is the word.
Is visible light longer or shorter then rays?
Visible light is made of rays. There are rays with wavelengths that are shorter than visible light and other with longer wavelength.
What is MCD brightness for solar lights?
MCD is short for millicandela But the convertion to other ligthing unit is not simple There is no definitive answer. A millicandela rating is determined by an on-axis measurement of peak intensity at a specific current, not by measuring total light output. Since the light emitted by a diffused LED is spread over a wide viewing angle, the on-axis value may actually be less than a non-diffused LED from which all light output is concentrated in a narrow beam. Thus the total light output of a 20 mcd LED may be greater than that of a 100 mcd LED though the on-axis reading is less.
This link provides a wizard to help you
http://led.linear1.org/lumen.wiz
What time of day is a shadow the most accurate representation of an objects size?
When the angle of the sun above the horizon is 45 degrees, then an error in measuring its altitude leads to the smallest error in calculating an object's size by measuring the length of its shadow.
So, if you are located in a place where it's possible for the sun to appear 45 degrees above the horizon at any time of day, then that's the time of day when such a calculation is most accurate.
If you're located in a place where it's neverpossible for the sun to appear 45 degrees above the horizon at any time of day, then the best time would be the time when the sun is as high as possible in the sky. That's local solar Noon.
How are visible light rays and X-rays similar?
Visible light and X-rays are examples of electromagnetic radiation. They are the same exact physical phenomenon, with all the same characteristics and properties, and they differ only in their wavelength (frequency).
When encountering vessels in the darkness what do visible white and green lights indicate?
In maritime navigation, visible white lights indicate a vessel's masthead light or stern light, while green lights signify the starboard side of a vessel. When encountering another vessel in darkness, if you see a green light, it means the vessel is approaching from your right side. Conversely, a visible white light could suggest that you are either approaching the stern of the vessel or that it is facing you. Understanding these light signals helps in determining the direction and movement of nearby vessels to avoid collisions.
