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Which of the following waves are used by the common TV remote control ?
1. Radio waves
2. Ultraviolet waves
3. Infrared waves
4. Ultrasonic wave

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Correct Answer - Option 3 : Infrared waves

The correct answer is Infrared waves.

  • 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.
  • Infrared radiations are basically thermal waves.
    • These are used in electronic applications like TV remote sensors.
    • It is also used in thermal imaging cameras.

  • Ultrasonic waves are sound waves that are greater than 20,000 Hz.
    • Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz.
    • Humans cannot hear Ultrasonic waves.
  • 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 sun-tanning.
  • Radio waves have the longest wavelengths in the EM spectrum. These are best-known for their use in communication technologies, such as television, mobile phones, and radios.

 

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