Which among the following waves is not an electromagnetic wave?

The correct answer is Cathode Rays.

Key Points

•  Cathode Rays:-
  • Cathode rays are streams of electrons emitted from the cathode (negatively charged electrode) of a vacuum tube.
  • They are produced when a high voltage is applied between the cathode and another electrode, called the anode (positively charged electrode).
  • The electrons are accelerated by the electric field and travel through the vacuum tube at high speeds.
  • It is not an Electronic Magnetic Wave.

 Additional Information

• Ultraviolet (UV) rays:-
  • These are a type of electromagnetic radiation with wavelengths shorter than visible light and longer than X-rays.
  • UV rays are not visible to the human eye, but they can have a significant impact on our health and the environment.
  • UV rays are produced by the sun, but they can also be produced by artificial sources, such as tanning beds and germicidal lamps.
• Infrared (IR) rays:-
  • These are a type of electromagnetic radiation with wavelengths longer than visible light and shorter than microwaves.
  • IR rays are not visible to the human eye, but we can feel them as heat.
  • IR rays are produced by all objects with a temperature above absolute zero. The hotter the object, the more IR rays it produces.
• Gamma rays:
  • These are the most energetic type of electromagnetic radiation.
  • They have shorter wavelengths and higher energies than X-rays.
  • Gamma rays are produced by radioactive decay, nuclear reactions, and certain astronomical events.
  • Gamma rays are highly penetrating and can damage living cells. They are used in a variety of applications, such as cancer treatment, medical imaging, and materials science.