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Online Physics Glossary
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Word Meaning Remarks
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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