Question

Two events take place simultaneously at points A and B as seen in the lab frame. They also occur simultaneously in a frame moving with respect to the lab in a direction

• A. parallel to AB
• B. perpendicular to AB
• C. making an angle of 45${}^o$ with AB
• D. making an angle of 135${}^o$ with AB

Answer 1

The correct option is B perpendicular to AB

If one reference frame assigns precisely the same time to two events that are at different points in space, a reference frame that is moving relative to the first will generally assign different times to the two events (the only exception being when motion is exactly perpendicular to the line connecting the locations of both events).