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How can one say that speed of light is constant.Is there any possibilities of speeds greater the c.If Yes/no then why?
The speed of light, denoted by the letter c, is considered to be a fundamental constant in physics. This means that it does not change in any known circumstances and is the same for all observers regardless of their relative velocity. So, yes, the speed of light is believed to be truly constant.
According to Einstein's theory of relativity, it is impossible for any object with mass to reach or exceed the speed of light. The speed of light is the maximum speed at which energy, matter, and information can travel, and it would require an infinite amount of energy to accelerate an object to the speed of light.
Based on the evidence and observations, the speed of light has remained constant throughout history. However, some theories suggest that in the early stages of the universe, the speed of light may have been different due to the extreme conditions at that time.
The speed of light is typically measured using various experimental methods, including the use of lasers, mirrors, and precise clocks. One of the most accurate methods is the use of interferometry, which measures the interference patterns of light waves to determine their speed.
If the speed of light is not constant, it would mean that one of the fundamental principles of modern physics, the special theory of relativity, is incorrect. This would have significant implications for our understanding of the universe and the laws of nature. It would also require a complete revision of many scientific theories and equations.