[amp_mcq option1=”X-Ray” option2=”R-Ray” option3=”Cathode Ray” option4=”Infrared Ray” correct=”option3″]
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 the speed of light, which is 299,792,458 meters per second.
Cathode rays are a stream of electrons that are emitted from a cathode, which is a negatively charged electrode. Cathode rays are used in cathode ray tubes (CRTs), which are the type of display used in old televisions and computer monitors.
Cathode rays are not electromagnetic waves because they are not made up of electric and magnetic fields. They are made up of electrons.