In modern physics, the double-slit experiment is a demonstration that light and matter can display characteristics of both classically defined waves and particles; moreover, it displays the fundamentally probabilistic nature of quantum mechanical phenomena. This type of experiment was first performed by Thomas Young in 1802, as a demonstration of the wave behavior of visible light. At that time it was thought that light consisted of either waves or particles. With the beginning of modern physics, about a hundred years later, it was realized that light could in fact show behavior characteristic of both waves and particles. In 1927, Davisson and Germer demonstrated that electrons show the same behavior, which was later extended to atoms and molecules. Thomas Young's experiment with light was part of classical physics long before the development of quantum mechanics and the concept of wave–particle duality. He believed it demonstrated that the wave theory of light was correct, and his experiment is sometimes referred to as Young's experiment or Young's slits.
In physics, interference is a phenomenon in which two waves combine by adding their displacement together at every single point in space and time, to form a resultant wave of greater, lower, or the same amplitude. Constructive and destructive interference result from the interaction of waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency. Interference effects can be observed with all types of waves, for example, light, radio, acoustic, surface water waves, gravity waves, or matter waves.
The pupil is a black hole located in the center of the iris of the eye that allows light to strike the retina. It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil. The term "pupil" was coined by Gerard of Cremona.
In quantum mechanics, a probability amplitude is a complex number used for describing the behaviour of systems. The modulus squared of this quantity represents a probability density.
An alidade or a turning board is a device that allows one to sight a distant object and use the line of sight to perform a task. This task can be, for example, to triangulate a scale map on site using a plane table drawing of intersecting lines in the direction of the object from two or more points or to measure the angle and horizontal distance to the object from some reference point's polar measurement. Angles measured can be horizontal, vertical or in any chosen plane.
A monochromator is an optical device that transmits a mechanically selectable narrow band of wavelengths of light or other radiation chosen from a wider range of wavelengths available at the input. The name is from the Greek roots mono-, "single", and chroma, "colour", and the Latin suffix -ator, denoting an agent.
A slit drum or slit gong is a hollow percussion instrument. In spite of the name, it is not a true drum but an idiophone, usually carved or constructed from bamboo or wood into a box with one or more slits in the top. Most slit drums have one slit, though two and three slits occur. If the resultant tongues are different width or thicknesses, the drum will produce two different pitches. It is used throughout Africa, Southeast Asia, and Oceania. In Africa such drums, strategically situated for optimal acoustic transmission, have been used for long-distance communication.
Sultan Anyakrakusuma is known as Sultan Agung was the third Sultan of Mataram in Central Java ruling from 1613 to 1645. A skilled soldier he conquered neighbouring states and expanded and consolidated his kingdom to its greatest territorial and military power.
Wheeler's delayed-choice experiment describes a family of thought experiments in quantum physics proposed by John Archibald Wheeler, with the most prominent among them appearing in 1978 and 1984. These experiments are attempts to decide whether light somehow "senses" the experimental apparatus in the double-slit experiment it travels through, adjusting its behavior to fit by assuming the appropriate determinate state for it, or whether light remains in an indeterminate state, exhibiting both wave-like and particle-like behavior until measured.
The agung is a set of two wide-rimmed, vertically suspended gongs used by the Maguindanao, Maranao, Sama-Bajau and Tausug people of the Philippines as a supportive instrument in kulintang ensembles. The agung is also ubiquitous among other groups found in Palawan, Panay, Mindoro, Mindanao, Sabah, Sulawesi, Sarawak and Kalimantan as an integral part of the agung orchestra.
The babandil is a single, narrow-rimmed Philippine gong used primarily as the “timekeeper” of the Maguindanao kulintang ensemble.
The gandingan is a Philippine set of four large, hanging gongs used by the Maguindanao as part of their kulintang ensemble. When integrated into the ensemble, it functions as a secondary melodic instrument after the main melodic instrument, the kulintang. When played solo, the gandingan allows fellow Maguindanao to communicate with each other, allowing them to send messages or warnings via long distances. This ability to imitate tones of the Maguindanao language using this instrument has given the gandingan connotation: the “talking gongs.”
Struck idiophones is one of the categories of idiophones that are found in the Hornbostel-Sachs system of musical instrument classification.
Roll slitting is a shearing operation that cuts a large roll of material into narrower rolls. There are two types of slitting: log slitting and rewind slitting. In log slitting the roll of material is treated as a whole and one or more slices are taken from it without an unrolling/re-reeling process. In rewind slitting the web is unwound and run through the machine, passing through knives or lasers, before being rewound on one or more shafts to form narrower rolls. The multiple narrower strips of material may be known as mults or pancakes if their diameter is much more than their width. For rewind slitting the machine used is called a slitter rewinder, a slitter or a slitting machine – these names are used interchangeably for the same machines. For particularly narrow and thin products, the pancakes become unstable, and then the rewind may be onto a bobbin-wound reel: the rewind bobbins are much wider than the slit width and the web oscillates across the reel as it is rewound. Apart from the stability benefit it is also then possible to put very long lengths,, onto one bobbin.
A pura is a Balinese Hindu temple, and the place of worship for adherents of Balinese Hinduism in Indonesia. Puras are built in accordance to rules, style, guidance and rituals found in Balinese architecture. Most puras are found on the island of Bali, where Hinduism is the predominant religion; however many puras exist in other parts of Indonesia where significant numbers of Balinese people reside. Mother Temple of Besakih is the most important, largest and holiest temple in Bali. Many puras have been built in Bali, leading it to be titled "the Island of a Thousand Puras".
Bamboo's natural hollow form makes it an obvious choice for many musical instruments.
Strip photography, or slit photography, is a photographic technique of capturing a two-dimensional image as a sequence of one-dimensional images over time, in contrast to a normal photo which is a single two-dimensional image at one point in time. A moving scene is recorded, over a period of time, using a camera that observes a narrow strip rather than the full field. If the subject is moving through this observed strip at constant speed, they will appear in the finished photo as a visible object. Stationary objects, like the background, will be the same the whole way across the photo and appear as stripes along the time axis; see examples on this page.
The bale kulkul or bale kul-kul is a Balinese pavilion where a slit-log drum is placed. It is essentially a drum tower or a watch tower. A bale kulkul can has a civic function, such as those used in villages as a mean of communication; or for religious function, an integral part of Balinese temple architecture.
