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A linearly polarised electromagnetic wave in vacuum is E=3.1 [ (1.8 )z- (5.4× 10^6 )t ]iNC^-1 is incident normally on a perfectly reflecting wall at z=a. Choose the correct option.

The reflected wave will be 3.1 [ (1.8 )z+ (5.4× 10^6 )t ]iNC^-1.

The frequency of electromagnetic wave is 54× 10^4Hz.

The transmitted wave will be 3.1 [ (1.8 )z- (5.4× 10^6 )t ]iN/C.

Electromagnetic Waves

JEE Main level, single correct, medium

78 of 165

Question 78 of 165

A linearly polarised electromagnetic wave in vacuum is $E=3.1\cos \left[\left(1.8\right)z-\left(5.4\times {10}^{6}\right)t\right]\hat{i}N{C}^{-1}$ is incident normally on a perfectly reflecting wall at $z=a$ . Choose the correct option.

Show answer and solution

Answer: (D) The reflected wave will be
$3.1\cos \left[\left(1.8\right)z+\left(5.4\times {10}^{6}\right)t\right]\hat{i}N{C}^{-1}$ .

Reflected wave will have direction opposite to incident wave.

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JEE Main 2025 Apr 2 Shift 1 question paper

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