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Video chapter:
00:00 - intro about Light speed
01:07 - Ancient concept about Light
02:01 - Galileo speed of light experiment
02:47 - Ole Rømer speed of light experiment
04:08 - James Bradley speed of light experiment
05:57 - Fizeau speed of light experiment
08:47 - Foucault speed of light experiment
09:09 - Michelson speed of light experiment
10:07 - James Clerk Maxwell's equations Explained in Bangla
15:05 - Heinrich Hertz electromagnetic waves
16:09 - Light speed and meter definition relation
19:41 - Measure the speed of light at home in bangla
21:00 - Question and Answer
The speed of light in vacuum, commonly denoted c, is a universal physical constant that is important in many areas of physics. The speed of light c is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour). According to the special theory of relativity, c is the upper limit for the speed at which conventional matter or energy, and thus any signal carrying information can travel through space.
Ole Rømer first demonstrated in 1676 that light travels at a finite speed (non-instantaneously) by studying the apparent motion of Jupiter's moon Io. Progressively more accurate measurements of its speed came over the following centuries. In a paper published in 1865, James Clerk Maxwell proposed that light was an electromagnetic wave and, therefore, travelled at speed c. In 1905, Albert Einstein postulated that the speed of light c with respect to any inertial frame of reference is a constant and is independent of the motion of the light source. He explored the consequences of that postulate by deriving the theory of relativity and, in doing so, showed that the parameter c had relevance outside of the context of light and electromagnetism.
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