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Travelling slit in double slit experiment

Physics Asked on July 4, 2021

In the double slit experiment, the interference pattern depends on the wavelength of the light. But if I run at the light source really fast shouldn’t the light blue shift and hence cause a different interference pattern. This is weird to me, because of the principle of relativity.

One Answer

If I understood you correctly, in this case you move the source and the slits and the screen are "at rest". I think, that you can say either that source is in motion or slits and screen are in motion. Interference pattern will be the same.

If source is "in motion", source's clock dilates at Lorentz factor. That means, blueshift will be a bit less blue than it should be in classical case.

If slits and screen approach source, gap between slits and screen Lorentz contracts. It leads to the same interference pattern.

Answered by Albert on July 4, 2021

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