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From the universal wave equation v = fλ, we can find that for an EM wave with wavelength 100 m and speed 300000000 m/s (all EM radiation propagate at speed of light), its frequency is 3000000 Hz or 3 MHz. This corresponds to the wavelength of radio waves, specifically short wave AM radio waves (aka HF raio waves), which has a frequency range of 3 MHz to 30 MHz.

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