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B
The velocity of light is the same for all observers
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C
Mass and energy are intra- convertible
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D
The universe is an entropic system
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E
Energy and momentum are conserved
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Solution
The correct option is B The velocity of light is the same for all observers The main postulate of Einstein's special theory of relativity is that the speed of light is constant and equal to c in all the inertial frames i.e the velocity of light is same for all observers.