男友太凶猛1v1高h,大地资源在线资源免费观看 ,人妻少妇精品视频二区,极度sm残忍bdsm变态

您現在的位置: > Language Tips > Easy English > Odd Question  
 





  Why does a room illuminated by a television appear blue?
[ 2006-04-19 08:52 ]

Color television pictures are produced by three different colors: red, green and blue. These combine to create a whitish light with a color temperature close to that of daylight (5500 to 6500 Kelvin).

Color temperature is a way of describing the relative amounts of the different colors that make up the light from a particular source. It can be thought of roughly as the temperature an object would need to be heated to give off light with that mixture of wavelengths. At low temperatures, low-energy colors such as red and yellow predominate; at higher temperatures the proportions of green or blue increase.

For example, standard tungsten light bulbs have a color temperature of 3200 K and are very yellow. Your eyes adjust to this light, making it appear whiter and more like daylight. At twilight or at night, anything with a higher color temperature than tungsten lights, such as a television, appears distinctly blue.

The same effect is seen if you look out of a room lit by tungsten light. The twilight appears particularly blue, and yet if you were to go outside and look at the same scene, the eye would no longer compare it to the lit room and the colors would appear more neutral.

The converse is also true. Viewed from outside, the windows of houses lit by tungsten light sources look distinctly yellow. Fluorescent sources generally have a spectrum much closer to that of daylight and don't produce the same effect.



whitish:
發白的

Kelvin: 絕對溫標

 

 

 

 


tungsten:

twilight: 黎明

 

 

 


converse:
相反的

fluorescent:
熒光的
spectrum: 光譜

 
 
 




主站蜘蛛池模板: 溧水县| 泗水县| 伊宁县| 昌宁县| 娄底市| 盐津县| 贵阳市| 徐水县| 九龙城区| 常熟市| 定安县| 罗源县| 永川市| 惠来县| 揭东县| 长泰县| 三门峡市| 丹寨县| 曲松县| 金堂县| 会东县| 施秉县| 乐至县| 常德市| 双桥区| 长宁区| 福泉市| 光泽县| 昭苏县| 孝昌县| 芜湖市| 方山县| 贡山| 罗江县| 奈曼旗| 融水| 柘荣县| 达尔| 韩城市| 山东| 万盛区|