A) \[c\]
B) \[0.707\,c\]
C) \[\sqrt{\frac{3}{2}}\,c\]
D) \[\frac{2}{3}\,c\]
Correct Answer: B
Solution :
\[\mu =\frac{1}{\sin C}=\frac{1}{\sin 45}=\frac{1}{\sin {{45}^{o}}}=\sqrt{2}\] Now \[{{v}_{m}}=\frac{{{v}_{a}}}{\mu }=\frac{c}{\sqrt{2}}=0.707\,\,c\]
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