Question

The waves used in common TV remote control are
1. X-Rays
2. Ultra-violet Rays
3. Infrared Rays
4. Gamma Rays

Answer 1

Correct Answer - Option 3 : Infrared Rays

The correct answer is Infrared Rays.

• The waves used in common TV remote control are Infrared Rays.
  •  Infrared (IR), sometimes called infrared light, is electromagnetic radiation (EMR) with wavelengths longer than those of visible light. 
  • It is therefore invisible to the human eye.
  • IR is generally understood to encompass wavelengths from the nominal red edge of the visible spectrum around 700 nanometers (frequency 430 THz) to 1 millimetre (300 GHz) (although the longer IR wavelengths are often designated rather as terahertz radiation).
  • Black-body radiation from objects near room temperature is almost all at infrared wavelengths.
  • As a form of electromagnetic radiation, IR propagates energy and momentum, with properties corresponding to both those of a wave and of a particle, the photon.

  

• An X-ray, or X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10 picometers to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz and energies in the range 124 eV to 124 keV.
• Ultraviolet (UV) is a form of electromagnetic radiation with a wavelength from 10 (with a corresponding frequency around 30 PHz) to 400 nm (750 THz), shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs and specialized lights, such as mercury-vapour lamps, tanning lamps, and black lights.
• A Gamma-ray, or gamma radiation, is a penetrating form of electromagnetic radiation arising from the radioactive decay of atomic nuclei. It consists of the shortest wavelength electromagnetic waves and so imparts the highest photon energy.