Word - The Physics Teacher
... Information is transmitted over long distances using optical fibres in which a ray of light is guided along a fibre. Each fibre consists of a core of high quality glass with a refractive index of 1.55 and is coated with glass of a lower refractive index. (i) Explain, with the aid of a labelled diagr ...
... Information is transmitted over long distances using optical fibres in which a ray of light is guided along a fibre. Each fibre consists of a core of high quality glass with a refractive index of 1.55 and is coated with glass of a lower refractive index. (i) Explain, with the aid of a labelled diagr ...
Physics Laboratory Last update: 2003.5.26 Experiment 8. Where
... absorbing light or by mechanical(kinetic energy transfer by collision) method (b) emits light with the energy of the energy difference(c) to go back to it’s ground state. By this mechanism, all objects emits (or absorb) electromagnetic waves. The picture on the right shows that an object with the te ...
... absorbing light or by mechanical(kinetic energy transfer by collision) method (b) emits light with the energy of the energy difference(c) to go back to it’s ground state. By this mechanism, all objects emits (or absorb) electromagnetic waves. The picture on the right shows that an object with the te ...
Daylighting
Daylighting is the practice of placing windows or other openings and reflective surfaces so that during the day natural light provides effective internal lighting. Particular attention is given to daylighting while designing a building when the aim is to maximize visual comfort or to reduce energy use. Energy savings can be achieved from the reduced use of artificial (electric) lighting or from passive solar heating or cooling. Artificial lighting energy use can be reduced by simply installing fewer electric lights because daylight is present, or by dimming/switching electric lights automatically in response to the presence of daylight, a process known as daylight harvesting.Daylighting is a technical term given to a common centuries-old, geography and culture independent design basic when ""rediscovered"" by 20th century architects. The amount of daylight received in an internal space can be analyzed by undertaking a daylight factor calculation. Today, the use of computers and proprietary industry software, such as Radiance, can allow an architect or engineer to quickly undertake complex calculations to review the benefit of a particular design.There is no direct sunlight on the polar-side wall of a building from the autumnal equinox to the spring equinox. Traditionally, houses were designed with minimal windows on the polar side but more and larger windows on the equatorial-side. Equatorial-side windows receive at least some direct sunlight on any sunny day of the year (except in tropical latitudes in summertime) so they are effective at daylighting areas of the house adjacent to the windows. Even so, during mid-winter, light incidence is highly directional and casts deep shadows. This may be partially ameliorated through light diffusion, light pipes or tubes, and through somewhat reflective internal surfaces. In fairly low latitudes in summertime, windows that face east and west and sometimes those that face toward the pole receive more sunlight than windows facing toward the equator.