The electric field component of an electromagnetic wave in vaccum is given as $\vec E = 3\cos \,\left( {1.8y + 5.4 \times {{10}^8}\,t} \right)\hat i$ Its direction of propagation and wavelength is
The electric field component of an electromagnetic wave in vaccum is given as $\vec E = 3\cos \,\left( {1.8y + 5.4 \times {{10}^8}\,t} \right)\hat i$ Its direction of propagation and wavelength is
- A
$\hat j,\, 1.8\,m$
- B
$-\hat j,\, 1.8\,m$
- C
$\hat j,\, 3.5\,m$
- D
$-\hat j,\, 3.5\,m$
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