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According To How Stuff Works , if you tap a 9 volt battery on a coin it will transmit Radio waves. I was wondering, because I don't have a radio with me at the moment, Is there a way I could discover the frequency that it is transmitting using math? Possibly involving Maxwell's Equations?

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Spark-gap transmitters like that transmit in a wide band. Your source states that the specific transmitter can be received, e.g., in the standard AM band, but I did not check that experimentally. You don't need fine tuning though:-)

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protected by Qmechanic Jan 9 '13 at 13:32

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