Question:
Infrared radiation was discovered in $1800$ by :
Infrared radiation was discovered in $1800$ by :
Updated On: Jun 18, 2022
- William Wollaston
- William Herschel
- Wilhelm Roentgen
- Thomas Young
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The Correct Option is B
Solution and Explanation
Infrared waves are longer than those of visible light, just beyond the red end of the visible spectrum. Infrared $(IR)$ falls in the range of the $(EM)$ spectrum between microwaves and visible light. It has frequencies from about $3 \,GHz$ up to about $400 \,THz$ and wavelengths of about $30$ centimeters ($12$ inches) to $740$ nanometers ($0.00003$ inches) Infrared light is used in industrial, scientific, and medical applications. Night-vision devices using infrared illumination allow people or animals to be observed without the observer being detected. In astronomy, imaging at infrared wavelengths allows observation of objects obscured by interstellar dust. Infrared imaging cameras are used to detect heat loss in insulated systems, to observe changing blood flow in the skin, and to detect overheating of electrical apparatus. Infrared imaging is used extensively for military and civilian purposes.
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Concepts Used:
Electromagnetic Spectrum
The term used by scientists to describe the entire range of light that exists is the electrostatic spectrum. Light is a wave of alternating electric and magnetic fields. The propagation of light doesn't vary from waves crossing an ocean. Like any other wave, light also has a few fundamental properties that describe it. One is its frequency. The frequency is measured in Hz, which counts the number of waves that pass by a point in one second.
The electromagnetic waves that your eyes detect are visible light and oscillate between 400 and 790 terahertz (THz). That’s several hundred trillion times a second.