The electric field part of an electromagnetic wave in a medium is represented by : E x = 0 E y = 2.5 C N cos [ ( 2 π × 1 0 6 m rad ) t − ( π × 1 0 − 2 s rad ) x ] E z = 0 . The wave is

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The electric field part of an electromagnetic wave in a medium is represented by : ​ E x ​ = 0 E y ​ = 2.5 C N ​ cos [ ( 2 π × 1 0 6 m rad ​ ) t − ( π × 1 0 − 2 s rad ​ ) x ] ​ E z ​ = 0 . The wave is :NEET 2009 (Mains)

TestHub · Accepted Answer

As the coefficient of x is negative, it is moving along +ve x -axis and equating the equation E y ​ with y ω ⇒ f k ⇒ λ ​ = 2.5 cos [ ( 2 π × 1 0 6 ) t − ( π × 1 0 − 2 ) x ] = A cos ( ω t − kx ) = 2 π × 106 = 2 π ω ​ = 1 0 6 Hz = π × 1 0 − 2 = k 2 π ​ = π × 1 0 − 2 2 π ​ = 200 m ​

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