The electric field associated with an e.m wave in vacuum is given by \vec{E} =40 cos (kz – 6 × 108) \vec{i}, where E, Z and t are in volt/m, metre and seconds respectively. The value of wave vector K is (a) 2 m-1 (b) 0.5 m-1 (c) 6 m-1 (d) 3 m-1

The electric field associated with an e.m wave in vacuum is given by \

1.	The electric field associated with an e.m wave in vacuum is given by \vec{E} =40 cos (kz – 6 × 108) \vec{i}, where E, Z and t are in volt/m, metre and seconds respectively. The value of wave vector K is (a) 2 m-1 (b) 0.5 m-1 (c) 6 m-1 (d) 3 m-1
Answer» The electric field ASSOCIATED with an EM wave in vacuum is GIVEN byThe electric field associated with an electromagnetic wave in vacuum is given by ∣E ∣=40 cos(kz−6×108t), where E, z and t are in VOLT per meter, meter and SECOND respectively.

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The electric field associated with an e.m wave in vacuum is given by \vec{E} =40 cos (kz – 6 × 108) \vec{i}, where E, Z and t are in volt/m, metre and seconds respectively. The value of wave vector K is (a) 2 m-1 (b) 0.5 m-1 (c) 6 m-1 (d) 3 m-1

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