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Online Physics Glossary / Terms / Dictionary

Physics Definitions Start from L

Lepton - Particles made up of two or three quarks bound together by the strong force.

Linear Accelerator - An indivisible fundamental particle. There are six leptons plus their antiparticles.

Laser - Device that produces coherent light by stimulated emission of radiation.

Laser Induced Fusion - Proposed method of creating nuclear fusion by using heating caused by intense laser beams to squeeze matter together.

Law of Conservation of Energy - In a closed, isolated system, the total momentum is constant.

Law of Reflection - Angle of incidence of a wave is equal to the angle of reflection.

Law of Universal Gravitation - Gravitational force between two objects depends directly on the product of their masses and inversely on the square of their separation.

Lens - Optical device designed to converge or diverge light.

Lens Equation - See mirror equation.

Lenz’s Law - Magnetic field generated by an induced current opposes the change in field that caused the current.

Lever Arm - Component of the displacement of the force from the axis of rotation in the axis of rotation in the direction perpendicular to the force.

Light - Electromagnetic radiation with wavelengths between 400 and 700 nm that is visible.

Linear Relationship - Relationship between two variables, x and y, summarized by the equation y= ax + b, where a and b are constant.

Linear Restoring Force - Force in direction toward equilibrium position that depends linearly on distance from distance from that position.

Liquid - Materials that have fixed volume but whose shape depends on the container.

Lodestone - Naturally occurring magnetic rock.

Longitudinal Waves - Wave in which direction of disturbance is the same as the direction of travel of wave.

Loudness - Physiological measure of amplitude of a sound wave; heard on pitch and tone color as well as amplitude.

Lumen - Unit of luminous flux.

Luminance Intensity - Measure of light emitted by source in candelas; luminous flux divided by 4pie.

Luminous Flux - Flow of light from source measured in lumens.

Luminous Object - Object that emits light, as opposed to one that reflects light.

Lux - Unit of luminous flux; one lumen per square meter.

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