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$(A)$ Temperature of gas is made $4$ times and pressure $2$ times |
$(P)$ Speed becomes $2\sqrt 2$ times |
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$(B)$ Only pressure is made $4$ times without change in temperature |
$(Q)$ Speed become $2$ times |
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$(C)$ Only temperature is changed to $4$ times |
$(R)$ Speed remains unchanged |
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$(D)$ Molecular mass of the gas is made $4$ times |
$(S)$ Speed becomes half |
${z_1},{z_2}$ 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

