question_answer

A wave represented by the equation is superimposed with another wave to form a stationary wave such that the point x – 0 is node. The equation for the other wave is                            [JEE ONLINE 12-05-2012]

A)         

B)

C)       

D)

Correct Answer: B

Solution :

[b] Since the point x = 0 is a node and reflection is taking place from point x = 0. This means that reflection must be taking place from the fixed end and hence the reflected ray must suffer an additional phase change of or a path change of

So, if

Hence equation for the other wave