A) \[6.64\text{ }\overset{{}^\circ }{\mathop{A}}\,\]
B) \[1.058\text{ }\overset{{}^\circ }{\mathop{A}}\,\]
C) \[2.116\text{ }\overset{{}^\circ }{\mathop{A}}\,\]
D) \[13.28\text{ }\overset{{}^\circ }{\mathop{A}}\,\]
Correct Answer: A
Solution :
\[2\pi r\,\,=\,\,n\lambda \] \[n=2\,\,\Rightarrow \,\,2\pi r=2\lambda \] \[\Rightarrow \,\,\lambda =\pi r\] \[\lambda =3.14\times 2.116\,\overset{{}^\circ }{\mathop{A}}\,\] \[\lambda \approx 6.64\,\overset{{}^\circ }{\mathop{A}}\,\]
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