6. •• Suppose, in Figure 26.4a, that the distance between events A and B is 1200 m. The observer is stationed exactly in the middle as shown but does not receive the signals simultaneously. Her detector receives the flash from B 2.00 μs before the flash from A.

(a) Are the events simultaneous according to her?

Explain.

(b) Where should she have stood, relative to A, to have received the signals simultaneously?

(c) Is there another observer, moving parallel to her x-axis, who could observe the two events simultaneously? If not, explain why not. If so, in which direction should this observer be moving?

(d) Could event B have caused event A? Explain.