It is the tenth brightest star in the night sky, although its brightness varies. It is over 10,000 times as luminous as the sun, and lies 650 light-years from earth.
Light takes 60 minutes to travel across the giant star.
2. Relating to or being in alphabetical order.
3. Designating the first in order of importance or discovery; such as, the alpha test.
4. In computer science, the first test version; a description of the first working version of a new hardware or software product or upgrade.
Some features of the product may not be implemented in the alpha version and the discovery of significant bugs is usually anticipated.5. A description of an the atom nearest to a particular atom or group of atoms in an organic molecule.
6. Indicating the first of a series of radiations or emissions arranged in order of increasing frequency; for example, alpha rays, alpha particle.
2. The basic meaning of something; the crucial part; the most important aspect of something.
The beginning and the end, the first and the last, as in "She had to master the alpha and omega of the new computer program before she could even begin."
This idiom and its meaning, based on the first and last letters of the Greek alphabet, appears in the New Testament (Revelation 1:8): "I am Alpha and Omega, the beginning and the ending, saith the Lord," where it is repeated three more times.
Beta arc refers to arousal of higher cortical paths by the functioning of an alpha arc; thus, leading to a "sensation" rather than simple "awareness", and not by an outside stimulus directly.
The term alpha arc is approximately equivalent to immediate response in Watson's behavioristic psychology, while the term beta arc is roughly equivalent to Watson's delayed response or implicit behavior.
An example would be when an atom of uranium isotope of mass 238, on emitting an alpha particle, becomes an atom of thorium, mass 234.
They consist of two neutrons and two protons and so they are identical to the nucleus of a helium atom and are one of the products of the spontaneous disintegration of radioactive elements; such as, radium and thorium.
The process of emission, alpha decay, transforms one element into another, decreasing the atomic (or proton) number by two and the atomic mass (or nucleon number) by four.
It is a product of disintegration of various isotopes of both natural and artificial radioactive elements.
A-, an-, as prefixed to terms or stems of Greek or Latin origin, often means "apart from" or "not concerned with"; for example, an amoral approach to economics is one that is "not concerned with moral issues".
2. The normal brainwave in the electroencephalogram of a person who is awake but relaxed.
3. A pattern of smooth, regular electrical oscillations in the human brain that occur when a person is awake and relaxed.
As recorded by the electroencephalograph, alpha waves have a frequency of 8 to 13 hertz.
In alpha biofeedback training, the subject receives information on his or her EEG as a means of achieving a state of relaxation.
In one technique, a tone sounds in the absence of alpha waves and disappears when the subject produces alpha waves.