Two sound waves having frequencies $250 \,Hz$ and $256 \,Hz$ superimpose to produce a beat wave. The resultant beat wave has intensity maximum at $t=0$. After how much time will an intensity minimum be produced at the same point?
- A$\frac{1}{6} \,s$
- B$\frac{1}{24} \,s$
- C$\frac{1}{18} \,s$
- D$\frac{1}{12} \,s$
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