A plane polarized monochromatic EM wave is travelling a vacuum along \(z\) direction such that at \(t={t}_{1}\) it is found that the electric field is zero at a spatial point \({z}_{1}\). The next zero that occurs in its neighborhood. is at \({z}_{2}\). The frequency of the electromagnetic wave is:
1
\(\cfrac { 3\times { 10 }^{ 8 } }{ \left| { z }_{ 2 }-{ z }_{ 1 } \right| } \)
2
\(\cfrac { 6\times { 10 }^{ 8 } }{ \left| { z }_{ 2 }-{ z }_{ 1 } \right| } \)
3
\(\cfrac { 1.5\times { 10 }^{ 8 } }{ \left| { z }_{ 2 }-{ z }_{ 1 } \right| } \)
4
\(\cfrac { 1 }{ { t }_{ 1 }+\cfrac { \left| { z }_{ 2 }-{ z }_{ 1 } \right| }{ 3\times { 10 }^{ 8 } } } \)