28) a Sinusoidal Electromagnetic Wave Is Propagating in Vacuum

question 24

Short Answer

28) A sinusoidal electromagnetic wave is propagating in vacuum. At a given point P and at a particular time, the electric field is in the +x direction and the magnetic field is in the -y direction.
(a) What is the direction of propagation of the wave?
(b) If the intensity of the wave at point P is 0.36 W/m², what is the electric field amplitude at that point? (c = 3.00 × 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

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Definitions:

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A manual welding technique using a fixed-length electrode and electric current to join metal parts.

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A visible plasma discharge caused by electrical current passing through air, used in welding and other industrial processes.

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