When two sound waves with a phase difference of ` pi //2`, and each having amplitude A and frequency `omega` , are superimposed on each other, then the maximum amplitude and frequency of resultant wave is
A. `(A)/(sqrt(2)) : (omega)/(2)`
B. `(A)/(sqrt(2)) : omega`
C. `sqrt(2) A : (omega)/(2)`
D. `sqrt(2)A : omega`