"अत्यन्त निम्न आवृत्ति (ULF)": अवतरणों में अंतर
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आशीष भटनागर (वार्ता | योगदान) नया पृष्ठ: {| align="right" border="0" class="wikitable" |- ! अत्यन्त निम्न आवृत्ति (ULF) |- | साइकिल प्रति सै:... |
(कोई अंतर नहीं)
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15:19, 30 जनवरी 2008 का अवतरण
| अत्यन्त निम्न आवृत्ति (ULF) |
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| साइकिल प्रति सै: 300 Hz से 3000 Hz तरंग दैर्घ्य: 1000 km से 100 km |
The Ultra Low Frequency (ULF) is the frequency range between 300 hertz and 3 kilohertz. Many types of waves in the ULF frequency band can be observed in the magnetosphere and on the ground. These waves represent important physical processes in the near-Earth plasma environment. The speed of the ULF waves is often associated with the Alfven velocity that depends on the ambient magnetic field and plasma mass density.
This band is used for communications in mines, as it can penetrate the earth. [1]