Answers

2014-10-25T17:57:19+08:00
The  longest are the lowest frequency
these are up to 100 billion meters long
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2014-10-25T22:49:31+08:00
The longest waves are the lowest frequency. Their name is not surprising: ULF waves, or Ultra-Low Frequency waves. These are up to 100 billion meters long (100 million km). They are found in Earth's magnetic field.
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