NOUN | substance | Hf, hafnium, atomic number 72 | a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals |
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attribute | HF, high frequency | 3 to 30 megahertz |
Meaning | A grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons. | |
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Synonyms | hafnium, atomic number 72 | |
Broader | metallic element, metal | Any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. |
Spanish | hafnio, número atómico 72 | |
Catalan | hafni, Hf, número atòmic 72 |
Meaning | 3 to 30 megahertz. | |
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Synonym | high frequency | |
Part of | electromagnetic spectrum | The entire frequency range of electromagnetic waves |
Broader | radio frequency | An electromagnetic wave frequency between audio and infrared |
Spanish | alta frecuencia |
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