Speed of light difference in the speeds of photons of different energies, confirming that Lorentz invariance is verified at least down to the scale of the Planck length ("l" = ≈ ) divided by 1.2. In a medium, light usually does not propagate at a speed equal to "c"; further, different types of light wave will travel at different speeds. The speed at which the individual crests and troughs of a plane wave (a wave filling the whole space, with only one frequency) propagate is called the phase velocity "v". An actual physical signal with a finite extent (a pulse of light) travels
Speed of Light (album) Speed of Light (album) Speed of Light is the second solo studio album of actor and pop singer Corbin Bleu. It was released on March 10, 2009 by Hollywood Records. The album's first single is "Moments That Matter". In December 2008, Bleu performed the song at . For the promotion of the album, Bleu guested in many shows, including the "Today" show. When asked about the album, Bleu stated: “I got a chance to really be involved in the studio writing tracks and lyrics, everything. It’s a lot more personal experience and the album itself is a combination of different