試題詳解

12. Two observers are each travelling at 0.49c toward each other. Observer A sends a pulse of light toward observer B and observes that the pulse leaves her vehicle at a speed of 1.00 c. At what speed does observer B record the pulse moving?
(A) 0.49c
(B) 0.98c
(C) 1.00c
(D) 1.49c