palmu Säännöllisesti rakentaa application of radio waves Hallituksen määräys Yksinkertaistaa vaihtaa
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Radio Waves Used for communications Energy: Low energy Wavelength: a few cm to a few km Frequency: 10 2 Hz to 10 8 Hz Dangerousness: Not dangerous. - ppt download
Radio Waves: Definition, Types, Importance and Examples
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