What colors are reflected by a blue car?
Fred Perry Colour Block Zip Track Top In Gunmetal Grey, A colour block design in black and grey. A full front zip opening and a ribbed grey high collar with ribbed black cuffs on the long sleeves and a black ribbed waistband.
Who made colors?
Colours are made by reflected lights. When light hits an object, the color you see is being reflected, the ones you don't are being absorbed. Example: you have a blue object, blue is being reflected while the other colours are absorbed. With a colour like green, blue and yellow are reflected as the others are absorbed.
Why a red and green jumper apperas to be black under a blue light?
Something red absorbs all the colours of light except red (which it reelects to your eye). Something green absorbs all the colours of light except green (which it reelects to your eye). Thus both red and green will absorb blue light and nothing will be reflected to your eye and the absence of reflected light is perceived as black.
Why does a blue object illuminated by white light appear to be blue?
All other colours are absorbed by the blue object only letting the blue light be reflected or through
Why is a black table black?
A black table is black because all of the colours are absorbed , and none are reflected. It is the same for any other black item too, for example: A chair. Now, if a chair is red, that is because blue and green (the 2 other primary colours in light) are absorbed and red is reflected. It is the same for if a chair is blue or green, the two other colours are absorbed, so…
What happens when light hits a blue block?
Depends on the colour of the light, but with general white light, which is made up of many colours, the blue block absorbs all colours in the white light, apart from blue, which is reflected off the block into our eye, which is why the blue block appears blue to our eyes.
What three colours are used to build all colours on a color monitor screen?
Im Not So Sure About Colours On A Monitor Screen But.. Humans Can Only See Three Colours, Green, Blue And Red For Example A Leaf Looks Green Because Red And Blue Light Are Being Absorbed But Green Light Is Being Reflected. The Three Colours Mix To Create Other Colours Such As Magenta Or Cyan. If Something Looks Black Its Because All Three Colours Are Being Absorbed If Something Looks White Its Because All Three Colours…
What is the difference between light color and pigment color?
Light is transmitted colour, it is called additive colour. Pigment is reflected colour. They have different primary colours. When the light is reflected from something, as in paint, the three primary colours are red, yellow, and blue but for transmitted light the primary colours are red, green, blue - RGB. Computer screens and televisions use RGB colour. Red + Green gives yellow; Red + Blue gives magenta and Green + Blue gives cyan.
When white light shines on Peter's shirt the shirt looks blue Why does the shirt look blue?
White light is made up of three colours; red, green and blue. If the shirt appears blue, then the shirt has absorbed any other colours (green and red) and reflected the blue, making the shirt appear blue. I hope this has helped :)
Does the frequency of light change when it is reflected?
No. Otherwise, we would have seen new colours when light is reflected, since all the colours have different frequencies.
What causes an object to appear green?
White light consists of three primary colours, Green, Blue, and Red. Blue and Red light is absorbed into the object, and green light is reflected.
How is the color black formed?
Light is made up of 7 colours, Red, Orange, Yellow, Green, Blue, Indigo and Violet. So when light reflects off, say, an orange book, the colour orange is reflected back into your eyes and the orange book absorbs all the other colours, making us see orange. When we see black, no light is reflected. All the colours are absorbed so no light is reflected back into our eyes, making black. Hope this helped! ;)))
What does Bruntcliffe School uniform look like?
Bruntcliffe Shool Uniform is navy blue with yellow on the logo, which represent the Leedes colours. They wear a light blue + dark blue clip on tie with a white shirt. If you were in Yr8 or higher, you would have the option of a shirt, jumper and tie or just a plain navy blue polo shirt with the Bruntcliffe logo on it. You must NOT wear a jumper wiuth the polo shirt!
How light determines color?
light is a mixture of colours (visible spectrum) when light falls on a object ,the object absorbs all colours except the colour which is reflected and we see the reflected colour
When white is reflected?
Single-core 25-pair/50 conductor cable
The 25-pair color code, originally known as even-count color code,[1] is a color code used to identify individual conductors in twisted-pairwiring for telecommunications.
Color coding[edit]
With the development of new generations of telecommunication cables with polyethylene-insulated conductors (PIC) by Bell Laboratories for the Bell System in the 1950s, new methods were developed to mark each individual conductor in cables.[2] Each wire was identified by the combination of two colors, one of which is the major color, and the second the minor color. Major and minor colors are chosen from two different groups, resulting in 25 color combinations. The color combinations are applied to the insulation that covers each conductor. Typically, one color was a prominent background color of the insulation, and the other was a tracer, consisting of stripes, rings, or dots, applied over the background. The background color always matches the tracer color of its paired conductor, and vice versa.
The major, or primary group of colors consists of the sequence of white, red, black, yellow, and violet. The minor, or secondary color was chosen from the sequence blue, orange, green, brown, and slate.[3][4]
25-pair color coding using twisted pairs with solid color coding only, without tracers. This method was rarely used.
Pair no. | Major color | Minor color | ||
---|---|---|---|---|
1 | White | Blue | ||
2 | Orange | |||
3 | Green | |||
4 | Brown | |||
5 | Slate | |||
6 | Red | Blue | ||
7 | Orange | |||
8 | Green | |||
9 | Brown | |||
10 | Slate | |||
11 | Black | Blue | ||
12 | Orange | |||
13 | Green | |||
14 | Brown | |||
15 | Slate | |||
16 | Yellow | Blue | ||
17 | Orange | |||
18 | Green | |||
19 | Brown | |||
20 | Slate | |||
21 | Violet | Blue | ||
22 | Orange | |||
23 | Green | |||
24 | Brown | |||
25 | Slate |
The wire pairs are referred to either directly by their color combination, or by the pair number. For example, pair 9 is also called the red-brown pair. In technical tabulations, the colors are often suitably abbreviated.
Violet is the standard name in the telecommunications and electronics industry, but it is sometimes referred to as purple. Similarly, slate is a particular shade of gray. The names of most of the colors were taken from the conventional colors of the rainbow or optical spectrum, and in the electronic color code, which uses the same ten colors, albeit in a different order.[citation needed]
When used for POTS, the first wire is known as the tip or A-leg (U.K.) conductor and is usually connected to the positive side of a direct current (DC) circuit, while the second wire is known as the ring lead or B-leg (U.K.), and is connected to the negative side of the circuit. Neither of these two sides of the line has a connection to the local ground. This creates a balanced audio circuit with common-mode rejection, also known as a differential pair. The tip and ring convention is based on the 1⁄4″ (6.5 mm) TRS phone connectors, which were employed in telephone switchboards in the 19th and 20th centuries, where the tip contact of the connector is separated from the ring contact by a spacer of insulation. The connection furthest from the cable is known as the tip, the middle connection is the ring, and the (largest) connection closest to the wire is the sleeve.
Older Bell System wiring inside customer premises used 4-conductor untwisted wire cable. The 4 conductors were solid red, green, yellow & black wires. They match to the current 25-color code as follows:
green ('Line 1' tip) | white/blue |
red ('Line 1' ring) | blue/white |
black ('Line 2' tip) | white/orange |
yellow ('Line 2' ring) | orange/white |
25-pair telco cable pinout[edit]
A common application of the 25-pair color code is the cabling for the Registered Jack interface RJ21, which uses a female 50-pin miniature ribbon connector, as shown in the following table. The geometry of the pins of the receptacle (right hand image) corresponds to the pin numbers of the table. The left column of pins are the ring (R) conductors, while all tip (T) conductors are on the right.
Color (minor/major) | (R) | (T) | Color (major/minor) | The corresponding pin order in the female RJ21 connector |
---|---|---|---|---|
Pin No. | ||||
blue/white | 1 | 26 | white/blue | |
orange/white | 2 | 27 | white/orange | |
green/white | 3 | 28 | white/green | |
brown/white | 4 | 29 | white/brown | |
slate/white | 5 | 30 | white/slate | |
blue/red | 6 | 31 | red/blue | |
orange/red | 7 | 32 | red/orange | |
green/red | 8 | 33 | red/green | |
brown/red | 9 | 34 | red/brown | |
slate/red | 10 | 35 | red/slate | |
blue/black | 11 | 36 | black/blue | |
orange/black | 12 | 37 | black/orange | |
green/black | 13 | 38 | black/green | |
brown/black | 14 | 39 | black/brown | |
slate/black | 15 | 40 | black/slate | |
blue/yellow | 16 | 41 | yellow/blue | |
orange/yellow | 17 | 42 | yellow/orange | |
green/yellow | 18 | 43 | yellow/green | |
brown/yellow | 19 | 44 | yellow/brown | |
slate/yellow | 20 | 45 | yellow/slate | |
blue/violet | 21 | 46 | violet/blue | |
orange/violet | 22 | 47 | violet/orange | |
green/violet | 23 | 48 | violet/green | |
brown/violet | 24 | 49 | violet/brown | |
slate/violet | 25 | 50 | violet/slate |
Larger cables[edit]
For cables with more than 25 pairs, each group of 25 is called a binder group. The binder groups are marked with mylar ribbons using the same color coding system, starting with a white/blue ribbon, then a white/orange ribbon, and so on. The 24th binder group has a violet/brown ribbon, completing a super binder of 600 pairs.[3][4]
In cables of more than 600 pairs, each of the 100-pair binder group bundles is wrapped with a mylar binder ribbon, or string, matching the 'tip' colors of the color code, starting with white. The pattern then starts over with the first 25-pair group as white/blue, and continues indefinitely, in multiples of 600 pairs or parts thereof. For example, a 900-pair cable has the first 600 pairs in 24 groups of 25 pairs in a white binder, and the remaining 300 pairs in 12 groups of 25 pairs wrapped in a red binder.[3][4]
Some cables are 'mirrored' or 'clocked' with a pattern that is known throughout the telephone industry. Starting with the first binder group in the center, the technician counts the cable's groups in a spiral direction depending on the location of the central office or switch. If looking at the cable's core and the switch is in that direction, the groups are counted counter-clockwise. If the cable is the field side, the count is clockwise. There are indicators on the mylar ribbons to know where to begin for each layer and a diagram for the different cable sizes should be readily available for reference.[3][4]
Other color schemes are sometimes used for outdoor cables, particularly outside the U.S., but this color code is common for aerial and underground cables up to several thousand pairs in North America. In the UK, the British Post Office (later BT) used this color code for what is now known loosely as CW1308 specification cables, referring to the Post Office's 'Cable and Wire' specification No. 1308.
Extra pairs and colors[edit]
Colors of additional pairs in multi-pair cable as per Bell Standards
When working on aerial cable splicing and installation, it is common to use a telephone lineman's set or 'Butt Set' to communicate over long distances. To facilitate this, extra pairs of wires are embedded in cables. One extra pair (Red-White) may be embedded into cables that are 6 to 75 pairs; two pairs (Red-White and Black-White) may be encapsulated in cables of 100 to 300 pairs; and three pairs (Red-White, Black-White, and Yellow-White) may be included in cables of 400 to 900 pairs.[4] These extra pairs are often referred to as 'talk pairs', and are never used to deliver dial tone.
Optical fiber cables use a twelve-color code, where the first ten are the same as in the 25-pair color code, and the last two are Rose and Aqua.[5]
Memorizing the colors[edit]
Various mnemonics have been used to remember the color coding of the major color groups:
Why Run Backwards, You'll Vomit[6]
See also[edit]
References[edit]
- ^AT&T, Bell System Practices, Section 461-200-101 Issue 7, Connector Cables—Identification (May 1979)
- ^F.W. Horn, Even-Count Cable, Bell Laboratories Record 37(6), 208 (June 1959)
- ^ abcdHighhouse, John (1997). A Guide for Telecommunications Cable Splicing. Cengage Learning. ISBN9780827380660.
- ^ abcdeAmerican Telephone And Telegraph Company (February 1959). Even PIC Cables(PDF). Bell System Practices – Outside Plant Construction and Maintenance, Section G50.607.3 Issue 2.
- ^Color for Fiber Optic Cables
- ^Abruzzino, James: Communications Cabling (2E), page 187. CNC Press, 2000
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