Assertion: radio wave's wavelength | /r/HasProperty | about 0.5 micron
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Source sentences:
text: At the centre of the light spectrum the wavelength is about 0.5 micron (0.0000005 metre), or a frequency of 6 × 1014 hertz or 600,000 gigahertz (one gigahertz equals 1,000,000,000 hertz).