Identify the correct statement that relate to the electromagnetic waves from the following options. (C:1)

Question

BlackTom AI · Accepted Answer

The question asks which statement correctly describes electromagnetic waves. 
Option a: The claim that electromagnetic waves travel at the same speed in all mediums is incorrect. In reality, their speed depends on the medium’s refractive index; they travel fastest in vacuum and slower in other materials. 
Option b: Saying the electric and magnetic fields are parallel to each other is false. In electromagnetic waves, E and B fields are perpendicular to each other and also perpendicular to the direction of wave propagation, forming a mutually orthogonal trio. 
Option c: The statement that electromagnetic waves travel with a speed of 4.0×10^8 m/s in vacuum is erroneous. The accepted speed in vacuum is about 3.0×10^8 m/s (the constant c). 
Option d: The correct principle is that electromagnetic waves consist of oscillating, alternating electric and magnetic fields. These fields are perpendicular to each other and to the direction of travel, forming a transverse wave. This option accurately captures the fundamental nature of EM waves. 
In summary, only option d conveys the proper description of electromagnetic waves, while the others contain common misconceptions about speed in media, field orientation, or vacuum speed.

Identify the correct statement that relate to the electromagnetic waves from the following options. (C:1)

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