A) \[330\,m{{s}^{-1}}\]
B) \[660\text{ }m{{s}^{-1}}\]
C) \[990\,m{{s}^{-1}}\]
D) \[115\,m{{s}^{-1}}\]
E) \[550\text{ }m{{s}^{-1}}\]
Correct Answer: B
Solution :
\[n=\frac{v}{\lambda }=\frac{v}{2l}\] \[\therefore \] \[v=n(2l)=330\times 2=660\,m{{s}^{-1}}\]
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