JEE Main 2021 Physics question

A linearly polarized electromagnetic wave in vacuum is 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 Hz.
• (C)The transmitted wave will be: 3.1cos[(1.8)z-(5.4×10⁶)t]N/C.
• (D)The reflected wave will be: 3.1cos[(1.8)z+(5.4×10⁶)t]N/C.Correct