When it comes to SPECIAL RELATIVITY, what or why is... - choose one of the three

Question

When it comes to SPECIAL RELATIVITY, what or why is... - choose one of the three alternatives each for a) - d)

a) THE INVARIANCE OF THE INTERVAL (1. Space interval and time interval are the same for all - 2. Space interval and time interval are different for all - 3. Spacetime interval is the same for all)

b) LORENTZ CONTRACTION MEANS THAT A MOVING OBJECTS LENGTH (1. Is shorter in the direction of the object - 2. Is shorter in the perpendicular direction of the object - 3. Only appears to be shorter - optical illusion)

c) PRINCIPlE OF RELATIVITY SAYS THAT (1. The laws of physics are the same in every inertial (free-float) reference frame - 2. The speed of light is different in different inertial (free-float) reference frames - 3. The laws of physics are different in different inertial (free-float) reference frames)

d) ALL EVENTS (1. Can not be generally defined - 2. Is generally simultaneous/concurrent in all inertial frames - 3. Can not be defined in any inertial frame)

Explanation / Answer

a)-(3) the space-time interval is same for all.

b)-(1) is shorter in the direction of the object.

c)-(1) the laws of physics are the same in every inertial (free float) reference frame .

d)-(3) can not be defined in any inertial frame.

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