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Glossary Of Physics Terms
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Half-life:The time during which half the number of atoms in the element disintegrate.
Heisenberg uncertainty principle:It is impossible to have a particle that has an arbitrarily well-defined position and momentum at the same time.
Hertz:The unit of frequency, also known as cycles per second.
Hooke's law:Within elastic limit, stress is directly proportional to strain.
Horsepower:unit of power, 1H.P. = 746 Watts.
Huygens'principle:Each point on a light wavefront can be regarded as a source of secondary waves, the envelope of these secondary waves determining the position of the wavefront at a later time.

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