Which one among the following is not an electromagnetic wave? A. X-Ray B. R-Ray C. Cathode Ray D. Infrared Ray

The correct answer is C. Cathode ray.

An electromagnetic wave is a wave that is created by the oscillation of an electric and magnetic field. These waves can travel through the vacuum of space and through matter. Electromagnetic waves are classified by their wavelength, which is the distance between two consecutive peaks of the wave. The different types of electromagnetic waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.

Radio waves have the longest wavelength, while gamma rays have the shortest wavelength. All electromagnetic waves travel at

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