Speed of light can be calculated, "often with less than 5% error". Interferometry is another method to find the wavelength of electromagnetic radiation for determining the speed of light. A coherent beam of light (e.g. from a laser), with a known frequency ("f"), is split to follow two paths and then recombined. By adjusting the path length while observing the interference pattern and carefully measuring the change in path length, the wavelength of the light ("λ") can be determined. The speed of light is then calculated using the equation "c" = "λf". Before the advent of laser technology, coherent radio sources were used
Speed of Light (Speed song) soldier holding a lot of people. Finally, many people who were shot dead, including Chang-wook. This drama video tells of grief to those involved in the incident. Speed of Light (Speed song) "Speed Of Light" is the second single by South Korea boy group Speed. The single album by promotional singles "슬플약속 (That's My Fault)". In December 9, 2012, Core Contents Media released the first teaser photo for "It's Over" for their debut album Superior Speed. Before the release of the debut album, Speed's they released single album "Speed of Light" the title is 슬플약속 (That's My Fault) feat. Davichi's