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° with AB
(d) making an angle of 135° with AB

Answer 1

Explanation:

• If the same reference frame is assigned to two events at the same time, which are in space at different points, then the reference frame that traversing with relation to the first will generally assign to the two events at different times.
• There is only one exception, which is when the motion is perpendicular to the line exactly, which is connecting both events locations. So, the answer is perpendicular to AB.