Question

Which of the following is the infrared wavelength?
$(A){10^{ - 4}}cm$
$(B){10^{ - 5}}cm$
$(C){10^{ - 6}}cm$
$(D){10^{ - 7}}cm$

Answer 1

Infrared waves, often known as infrared light, are a type of electromagnetic wave. People are exposed to infrared wavelengths daily; the human eye cannot perceive them, but they can be detected as heat. To change channels on your TV, a remote control employs light waves that are slightly outside the visible spectrum of light, called infrared light waves.

Complete step-by-step solution:
Infrared (IR), often known as infrared light, is a type of electromagnetic radiation (EMR) that has wavelengths that are longer than visible light. As a result, it is not apparent to the naked eye. When molecules modify their rotational-vibrational motions, they emit or absorb infrared light.
From the visible spectrum's conventional red edge at $700$ nanometers (nm) to $1$ millimeter, infrared light exists (mm). The wavelengths in this range correspond to a frequency range of about $430$ THz to $300$ GHz. The microwave region of the electromagnetic spectrum is below infrared.
Infrared light is even utilized to heat food in some cases; fast-food restaurants frequently employ special lights that create thermal infrared waves! Shorter near-infrared waves aren't hot at all; in fact, you can't feel them at all. The shorter wavelengths are used by the remote control on your television.
The correct option is (a).

Note: Even objects that we consider to be extremely cold, like an ice cube, produce infrared. Hot charcoal, for example, does not emit light but does emit infrared radiation, which humans perceive as heat. The more infrared radiation a thing emits, the warmer it is.
The interior temperature of the eye is raised by IR, particularly IR-A or near IR [$700$nm-$1400$nm], which effectively "bakes" it. Long-term IR exposure has been linked to lens, cornea, and retina damage, including cataracts, corneal ulcers, and retinal burns, according to medical studies.