Question: A linearly polarized electromagnetic wave in vacuum is
$\mathrm{E}=3.1 \cos \left[(1.8) \mathrm{z}-\left(5.4 \times 10^{6}\right) \mathrm{t}\right] \hat{\mathrm{i}} \mathrm{N} / \mathrm{C}$
is incident normally on a perfectly reflecting wall at $\mathrm{z}=\mathrm{a}$. Choose the correct option
The wavelength is $5.4 \mathrm{~m}$
The frequency of electromagnetic wave is $54 \times 10^{4} \mathrm{~Hz}$
The transmitted wave will be
$3.1 \cos \left[(1.8) \mathrm{z}-\left(5.4 \times 10^{6}\right) \mathrm{t}\right] \hat{\mathrm{i}} \mathrm{N} / \mathrm{C}$
The reflected wave will be
$3.1 \cos \left[(1.8) z+\left(5.4 \times 10^{6}\right) t\right] \hat{\mathrm{i}} \mathrm{N} / \mathrm{C}$
$3.1 \cos \left[(1.8) \mathrm{z}+\left(5.4 \times 10^{6}\right) \mathrm{t}\right] \hat{\mathrm{i}} \mathrm{N} / \mathrm{C}$
Correct Option: , 4
Solution:
Reflected wave will have direction opposite to incident wave.
