Q3 of 46 Page 457

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.

The two events occur at the same time at points A and B in rest frame. If they occur simultaneously in a frame moving with respect to the lab, the frame must be moving in the direction perpendicular to AB.

Option (b) is correct.

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