A wave representing by the equation `y = a cos(kx - omegat)` is suerposed with another wave to form a stationary wave such that point `x = 0` is a node. The equation for the other wave is

Options

A. ` sin (Kx+ omega t)`
B. `- a cos (Kx- omegat)`
C. `- a cos (Kx- omega t)`
D. `- a sin (Kx- omega t)`

Answer

C

Explanation

For the formation of stationary wave, two identical waves should travel in opposite direction and the resultant y should be zero at ` x = 0 `. This is satisfied by (c ) .