|Select a letter||A||B||C||D||E||F||G||H||I||J||K||L||M||N||O||P||Q||R||S||T||U||V||W||X||Y||Z|
- Lamb Shift
- There is a difference between the first two energy levels
in the spectrum of hydrogen, this is called the Lamb Shift
after the Willis Eugene Lamb. [more]
- Law of conservation of Energy/Momentum
- Energy/momentum cannot be created or destroyed; it may
be changed from one form to another.
- Law of Universal Gravitation
- Gravitational force between two objects depends directly in the
product of their masses and inversely on the square of
- An optical device that produces very narrow beam
of monochromatic (one wavelength), coherence (in the same
phase) and intense light. It works by pumping electrons to a
higher excited state, the electron fall back and give out very
defined form of light. A laser was originally an acronym for
“Light Amplification by Stimulated Emission of Radiation”.
Name Charge Mass (GeV) Electron -1 0.000511 Electron Neutrino 0 ~0 Muon -1 0.1056 Muon Neutrino 0 ~0 Tau -1 1.777 Tau Neutrino 0 ~0
- A lepton (Greek for “light”, as opposed
to hadrons which are “heavy”) is a subatomic particle that is
not made of quarks. They include the electron, the muon, the tau, and their respective neutrinos.
- Light Year
- The distance light can travel in one
year, roughly 10 million million kilometers. For example, the
nearest known star, Proxima Centauri is 4.22 light years away.
- Light Emitting Diode
- Is a semiconductor device that emits
incoherent monochromatic light when electrically biased in the
forward direction. This effect is a form of electroluminescence.
The color depends on the semiconducting material used, and can
be near-ultraviolet, visible or infrared. Nick Holonyak Jr. developed
the first practical visible-spectrum LED in 1962.
- Latent Heat
- Is the heat that is added to a system that changes the
physical state of the substance e.g. changing from a light
to a gas. [more]