A) \[165\text{ }Hz\]
B) \[150\text{ }Hz\]
C) \[60{}^\circ \]
D) \[330\,Hz\]
Correct Answer: C
Solution :
[c] From \[\Delta x=\frac{\lambda }{2\pi }\Delta \phi ,\] \[\lambda =2\pi \frac{\Delta x}{\Delta \phi }=\frac{2\pi (0.4)}{1.6\pi }=0.5\] \[v=\frac{v}{\lambda }=\frac{330}{0.5}=660\,Hz\]
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