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Lorentz transformation and muon experiment - class-XI

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Multiple Choice
We don't observe space contraction in our every day lives and the reason is
  1. Space contraction is not noticeable until objects approach the speed of light.
  2. Space contraction does not occur until objects approach the speed of light.
  3. Space contraction only occurs in a vacuum.
  4. Space contraction is offset by the effect of gravity.
  5. Acceleration is necessary for length contraction.