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Harmonics are multiples (thirds, fifths, etc) or divisions of frequencies. In radio, harmonics can be used carry additional signals on a single base frequency. It is the harmonics of an audio frequency that make a musical instrument unique. By damping a string at a half or third/fifth of its length a harmonic is easily heard. The truth is they were always there, the damping of the incident wave just brings them to the fore. Scroll down to related links and look at "Calculations of Harmonics from Fundamental Frequency".

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15y ago
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11y ago

Endocrine glands secrete substances called hormones into the blood. They control growth, development, behaviour and reproduction.

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Q: What are harmones?
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