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 the resultant wave is:
- A$A / \sqrt{2}, \omega / 2$
- B$A / \sqrt{2}, \omega$
- C$\sqrt{2} A, \omega / 2$
- D$\sqrt{2} A, \omega$
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