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When an object moves at a very high speed relative to an observer, its measured length in the direction of motion is contracted. t true?

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Daisyphysics
Your statement is not completely correct.
When an object is moving towards the observer, its measured wavelength decreases,(it is not correct if measured length) because the waves are compressed.
AL2006
That's true. It doesn't even need to be very high speed, although the effect is too small to measure at low speeds.

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