The pattern of standing waves formed on a stretched string at two instants of time (extreme,mean) are shown in figure. The velocity of two waves superimposing to form stationary waves is $360\ ms^{-1}$ and their frequencies are $256\ Hz$. Which is not possible value of $t$ (in $sec$)
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$\frac{T}{4}=\frac{1}{t \times 4}=\frac{1}{256 \times 4}=10^{-4} \times 9.8\, \sec$
$\frac{3 \mathrm{T}}{4}=2.9 \times 10^{-3}$
$\frac{5 \mathrm{T}}{4}=4.9 \times 10^{-3}$
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