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Bell System such as a door bell? Or: The Bell System was the AT&T monopoly that provided telephone service in the United States from 1877 to 1984. In 1984, the company was broken up into separate companies, by a Federal mandate. I'll assume you mean door bell. pushbutton, wires, doorbell, and...

As one of your answer states, light always moves at the speed of light, for any observer. That includes your hypothetical traveler, who would see the light moving towards him at exactly the speed of light. .

I think you want a 1 MHz oscillator, not a 1 mHz, which is much different. These are not very common, you could search for a long time without finding either one. Audio transformers are rarely if ever used today, and I can't think of any applications for a pre-packaged 1 MHz oscillator. .