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8.Electromagnetic waves
medium
A linearly polarized electromagnetic wave in vacuum is $E=3.1 \cos \left[(1.8) z-\left(5.4 \times 10^{6}\right) {t}\right] \hat{\text { i }}\, {N} / {C}$ is incident normally on a perfectly reflecting wall at $z=a$. Choose the correct option
A
The wavelength is $5.4\, {m}$
B
The frequency of electromagnetic wave is $54 \times 10^{4}\, {Hz}$.
C
The transmitted wave will be $3.1 \cos \left[(1.8) z-\left(5.4 \times 10^{6}\right) {t}\right] \hat{i}\, {N} / {C}$
D
The reflected wave will be $3.1 \cos \left[(1.8) {z}+\left(5.4 \times 10^{6}\right) {t}\right] \hat{{i}}\, {N} / {C}$
(JEE MAIN-2021)
Solution
Reflected wave will have direction opposite to incident wave.
Standard 12
Physics
