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Which one is not an example of electromagnetic wave ?
1. X-rays
2. Ultraviolet rays
3. Supersonic waves
4. γ rays

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Correct Answer - Option 3 : Supersonic waves

The correct answer is Supersonic waves.

  •  Supersonic wave-
    • These waves are faster than the speed of sound.
    • When a plane travels faster than the speed of sound, the plane breaks the sound barrier and produces a loud sound. This is called a sonic boom.
    • This is not an example of an electromagnetic wave.
  • Electromagnetic waves are created as a result of vibrations between an electric field and a magnetic field.
  • We can say that these are composed of oscillating magnetic and electric fields.
  • EM Waves are- radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays.
  • Depending on the variations in wavelength and frequency, these waves have different applications.

  • X-rays waves are produced by accelerating electrons. 
    • These are used to view images of the bones and other structures in the body.
  • Gamma rays are ionizing radiation. It is emitted by the nucleus of some radionuclides following radioactive decay.
    • These are used in medicine (radiotherapy), industry (sterilization and disinfection) and the nuclear industry.
  • Ultraviolet radiation is widely used in industrial processes and in medical and dental practices for a variety of purposes, such as killing bacteria, creating fluorescent effects, curing inks and resins, phototherapy and suntanning.

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