waves

Question: Consider the three waves ${{z}_{1}},{{z}_{2}}$ and ${{z}_{3}}$ as ${{z}_{1}}=A\sin (kx-\omega \,t)$, ${{z}_{2}}=A\sin (kx+\omega \,t)$ and ${{z}_{3}}=A\sin (ky-\omega \,t)$. Which of the following represents a standing wave



1) ${{z}_{1}}+{{z}_{2}}$
2) ${{z}_{2}}+{{z}_{3}}$
3) ${{z}_{3}}+{{z}_{1}}$
4) ${{z}_{1}}+{{z}_{2}}+{{z}_{3}}$
Solution: Explanation: No Explanation
Stationary Waves

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