4 ms·
But to an observer, a "longer" meter is sill a meter.
by alxv 17y ago
But to an observer, a "longer" meter is sill a meter.
- jonsen 17y agoYes, and a "longer" second is still a second.
- dhimes 17y agoBut if you create something where a meter is shorter, then move it to where a meter is longer, you will have, for example, a photon whose wavelength you think you know (because you understand the process, say a hydrogen transition, that created it) have a slightly longer (red-shifted) wavelength.