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The frequency changes, as the speed of light c is always constant (299 792 458 meters /s).

For example; your favorite radio station frequency might change from 99.8 FM to 95.4 FM if the pitch was lowered, as the speed is unchanging.

Or, if the wavelength for the color blue was heightened in pitch over time, the color blue might appear to shift through the rainbow to red, infrared and beyond. In Astronomy, we see this all the time, it's called Redshift. very distant galaxies and stars appear to move away from us so fast, their light reaches us 'squashed together', and their light appears more red the further they are from our telescopes.

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