Wave

In physics, a wave is an oscillation accompanied by a transfer of energy that travels through space or mass. Frequency refers to the addition of time. Wave motion transfers energy from one point to another, which displace particles of the transmission medium—that is, with little or no associated mass transport. Waves consist, instead, of oscillations or vibrations (of a physical quantity), around almost fixed locations.

There are two main types of waves. Mechanical waves propagate through a medium, and the substance of this medium is deformed. The deformation reverses itself owing to restoring forces resulting from its deformation. For example, sound waves propagate via air molecules colliding with their neighbors. When air molecules collide, they also bounce away from each other (a restoring force). This keeps the molecules from continuing to travel in the direction of the wave.

The second main type of wave, electromagnetic waves, do not require a medium. Instead, they consist of periodic oscillations of electrical and magnetic fields originally generated by charged particles, and can therefore travel through a vacuum. These types of waves vary in wavelength, and include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.

Ancient history

Ancient history is the aggregate of past events from the beginning of recorded human history and extending as far as the Early Middle Ages or the Postclassical Era. The span of recorded history is roughly 5,000 years, beginning with Sumerian Cuneiform script, the oldest discovered form of coherent writing from the protoliterate period around the 30th century BC.

The term classical antiquity is often used to refer to history in the Old World from the beginning of recorded Greek history in 776 BC (First Olympiad). This roughly coincides with the traditional date of the founding of Rome in 753 BC, the beginning of the history of ancient Rome, and the beginning of the Archaic period in Ancient Greece. Although the ending date of ancient history is disputed, some Western scholars use the fall of the Western Roman Empire in 476 AD (the most used), the closure of the Platonic Academy in 529 AD, the death of the emperor Justinian I in 565 AD, the coming of Islam or the rise of Charlemagne as the end of ancient and Classical European history.

Sword

A sword is a bladed weapon intended for both cutting and thrusting. The precise definition of the term varies with the historical epoch or the geographical region under consideration. A sword in the most narrow sense consists of a straight blade with two edges and a hilt, but depending on context, the term is also often used to refer to bladed weapons with a single edge (also referred to as a backsword).

Historically, the sword developed in the Bronze Age, evolving from the dagger; the earliest specimens date to ca. 1600 BC. The later Iron Age sword remained fairly short and without a crossguard. The spatha, as it developed in the Late Roman army, became the predecessor of the European sword of the Middle Ages, at first adopted as the Migration period sword, and only in the High Middle Ages, developed into the classical arming sword with crossguard. The word sword continues the Old English, sweord.

The use of a sword is known as swordsmanship or (in an early modern or modern context) as fencing. In the Early Modern period, western sword design diverged into roughly two forms, the thrusting swords and the sabers:

Antique Temple

The Antique Temple is a small round temple in the west part of Sanssouci Park in Potsdam. Frederick the Great had the building constructed to house his collection of antique artifacts, coins and antique gems. Carl von Gontard created the building in 1768/69 near the New Palace north of the Central Alley, as a complement to the Temple of Friendship situated south of the Alley. Since 1921 the Antique Temple has been used as a mausoleum for members of the House of Hohenzollern and is not open to the public.

Usage under Frederick the Great

The Antique Temple was, like the Sanssouci Picture Gallery, envisioned from the beginning as a museum and at the time of Frederick the Great could be visited after notifying the castellan at the New Palace. Next to dozens of antique ornaments, such as marble urns, bronze figurines, tools, weights and ceramics, could be found the so-called 'Family of Lycomedes', ten life-sized marble statues on marble plinths. They came to Frederick the Great from the art collection of the French Cardinal Melchior de Polignac. Fifty busts of marble, basalt and bronze sat on brackets, 31 of which also came from Polignac's collection; the rest were from Friedrich's favourite sister, Princess Wilhelmine, Margravine of Brandenburg-Bayreuth. In a square annex that could only be reached through opening a door from the round central hall, the Coin Chamber was created. Four cedar wood cupboards were filled with over 9,200 gold, silver and bronze coins, around 4,370 engraved gems and cameos, 48 marble, terra cotta and bronze reliefs, and books from Frederick the Great's archaeological library.

Wave (disambiguation)

A wave is a disturbance that propagates through space and time, transferring energy. The original meaning was that of waves on water, or Wind waves. Many other phenomena are defined to be like waves.

Wave or waves may refer to:

Sciences