question_answer

When two sound waves travel in the same direction in a medium, the displacements of a particle located at ‘’ at time ‘t’ is given by:

Where  and  are in meters and t in seconds. The speed of sound in the medium is:  [JEE ONLINE 09-04-2013]

A)  92 m/s             

B)  200 m/s

C)       100 m/s                       

D)  332 m/s

Correct Answer: B

Solution :

[b]

As, both the waves moves with the same speed, so the speed of resultant wave should be 200 m/s.