Answer :

o If length of everything changes to twice then the length of meter bar or measuring tape also because twice so it not possible to detect the change because even human beings the building etc. will change proportionally

o if we make the hypothesis that speed of light is constant, then we can test the change of length in universe

o Then using our measurement techniques of time and length the speed of light will be found to be 1/2 of its original speed

o Clock will show the same time before they will not change time is found as ratio of two physical quantities so the doubling effect is cancelled

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