when you have a green light it makes the room appear green, and so on blue = blue........ so why dosnt a black light bulb make a room darker than the outside? this would be great for my afternoon sleeps! and yes i did paint a light bulb black. i dont get it.
2007-09-05 00:29:37 · 12 answers · asked by Anonymous in Science & Mathematics ➔ Physics
your so funny lol
hope you enjoy your kip
2007-09-05 00:41:47 · answer #1 · answered by dreams 6 · 0⤊ 0⤋
The light that we see is made up of radiation of different wavelengths. White light is the combination of all the colours in the visible spectrum ie the colours of the rainbow (red,orange, yellow,green, blue,indigo and violet). When white light (daylight or artificial, electric light from a bulb) hits a pigmented object (a painted wall, for example) the pigment absorbs certain wavelengths and reflects others - so light hitting a blue painted object will absorb all wavelengths except that of the colour blue, which it reflects. This is what we see as blue. If you put light through a filter such as the red glass of a coloured bulb it has the same effect - it absorbs all other wavelengths except red, which it allows through - this gives us a red light.
Black "light" as such is not possible because it is the absence of light. Painting a white lightbulb black will stop any light coming through but it does not produce a black light as such. The way to create the darkness you want for your afternoon sleeps is to ensure that all sources of light are masked off!
There is something which is referred to as "Black light" but this is, in fact, ultra violet, which is part of the invisible radiation spectrum and can only be seen when it shines on certain paints that are sensitive to UV or when veiwed through special goggles.
I hope that made sense - I don't know of a simpler way to explain it!
2007-09-05 00:59:14 · answer #2 · answered by A Nonny Mouse 7 · 0⤊ 0⤋
It's great to see you tried this out - brilliant!
In such situations, colours are additive - the colour of a bulb enhances the colours that are present - a blue bulb highlights the blue that is present in a room, the green highlights the green etc...
White light is a combination of all colours equally and therefore highlights all colours equally - the room appears brighter.
Black is a lack of any colour. Black absorbs all light, totally - hence no addition (or subtraction) to the colours in a room.
(I could go on about absorption spectra and the physics of how photons are generated as emmissive particles / waves within the atom [ duality of light ] plus the sensitivity of the human eye to light rays - but that's a little bit heavy ;D )
2007-09-05 00:52:38 · answer #3 · answered by cornflake#1 7 · 2⤊ 0⤋
Grass is green because it absorbs all the colours of the visible spectrum and reflects only green so the eye sees it as green.
Black which is not a colour absorbs all the visible spectrum and reflects none of the visible spectrum so we see it as black.
so when you painted your bulb black the light that was emitted from inside the bulb was absorbed by the black paint.
so making no different to the lightness in the room.
paint your wall black that will make a different it will absorb all the light and reflect none.
(visible spectrum is the the part of the electromagnetic spectrum that can be seen with the eye a better name for it is simply light)
2007-09-05 01:03:38 · answer #4 · answered by moho 3 · 0⤊ 0⤋
Firstly, you see things when light enters your eyes. A red light means red light enters your eyes, and makes you see red, and also for other lights. However, black simply means no light. And just by painting a light bulb black and turning it on will not reduce the amount of light which enters the room, from windows etc. Some ideas just don't work.
2007-09-05 00:38:23 · answer #5 · answered by Anonymous · 0⤊ 0⤋
They've all got this answer covered, but the last time I painted a light bulb, (the only time I painted a light bulb) the paint caught fire and set all the smoke alarms off. My head teacher was not amused! Another of my fiendishly hopeless science lessons gone wrong!!!
2007-09-05 03:21:26 · answer #6 · answered by Val G 5 · 0⤊ 0⤋
the 1st colour i presumed-approximately once you reported extraordinary and cheery replaced into yellow. Its extraordinary, reminds you of the solar and could pass with very almost any colour of fixtures which you have. you may paint the kitchen the comparable colour because of the fact the lounge in case you pick for. the only situation that I see with that's that there is not any colour seperation. you should stay with the comparable colour scheme yet pass to a particularly lighter or darker colour for the kitchen. you may pass away the ceiling white in case you pick for to. To me a white ceiling with colored partitions makes the room seem taller. the only time that i might paint a ceiling the comparable colour because of the fact the partitions is that if the partitions are painted a depressing wealthy colour. For the backside boards i like a taller board. It makes the partitions have greater of a based seem. no count which colour you pick for, you may upload a huge mirror to a wall to make the room seem better. in case you have a particular area that's no longer as
2016-10-09 23:59:02 · answer #7 · answered by ? 4 · 0⤊ 0⤋
the colour doesn't depend on the colour of the bulb but on the chemical inside that emits the light when heated. mostly noble gases give of light when heated.
2007-09-05 00:40:23 · answer #8 · answered by George 3 · 0⤊ 1⤋
As has been explained time and time again, Black is NOT a color. It is the ABSENCE of light.
How can you change the illumination in a room by adding NOTHING.
2007-09-05 00:39:24 · answer #9 · answered by Anonymous · 0⤊ 0⤋
Ever considered leaving the light off and drawing your curtains?:S
2007-09-05 00:40:12 · answer #10 · answered by Mark V 3 · 1⤊ 0⤋
what you need is a small black hole to suck up all of the light radiation bouncing around your room.
2007-09-05 00:40:26 · answer #11 · answered by Anonymous · 0⤊ 0⤋