The electric field associated with an e.m. wave in vacuum is given by E = i 40 ( z-6 10^…
Physics · Class 12 · CBSE — Electromagnetic Waves
The electric field associated with an e.m. wave in vacuum is given by \(\vec{E}=\hat{i} 40 \cos \left(\kappa z-6 \times 10^{8} t\right)\) , where E, z and t are in volt/m, metre and seconds respectively. The value of wave vector \(\kappa\) is
- 2 m-1
- 0.5 m-1
- 6 m-1
- 3 m-1
Answer
(A) 2 m -1
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