試題詳解

10. Two waves traveling in opposite directions interfere to produce a standing wave described by y = 3 sin(2x) cos (5t) where x is in m and t is in s. What is the wavelength of the interfering waves?
(A) 3.14 m
(B) 1.00 m
(C) 2.00 m
(D) 6.28 m
(E) 12.00 m