Infrared radiation (IR), also known as thermal radiation, is that band in the electromagnetic radiation spectrum with wavelengths above red visible light between 780 nm and 1 mm. IR is categorized as IR-A (780 nm-1.4 µm), IR-B (1.4-3 µm) and IR-C, also known as far-IR (3 µm-1 mm).
- 1 What wavelengths of light does infrared light contain?
- 2 What is the infrared region?
- 3 Which of the following is infrared wavelength?
- 4 How does the wavelength of infrared compared with the wavelength of visible light?
- 5 What emits infrared light?
- 6 Are infrared waves electromagnetic or transverse?
- 7 What part of the electromagnetic spectrum is known as the infrared region?
- 8 What is the wavelength of red light?
- 9 How is infrared wavelength measured?
- 10 Which of the following represents the wavelength?
What wavelengths of light does infrared light contain?
Infrared (IR) light is a type of electromagnetic radiation that lies between the visible end of the light spectrum, and the microwave spectrum (Vollmer and Mollmann, 2010). Its wavelength ranges from about 800 nm to 1 mm and it is emitted particularly by heated objects.
What is the infrared region?
Infrared light lies between the visible and microwave portions of the electromagnetic spectrum. Infrared light has a range of wavelengths, just like visible light has wavelengths that range from red light to violet. The heat that we feel from sunlight, a fire, a radiator or a warm sidewalk is infrared.
Which of the following is infrared wavelength?
IR frequencies range from about 300 gigahertz (GHz) up to about 400 terahertz (THz), and wavelengths are estimated to range between 1,000 micrometers (µm) and 760 nanometers (2.9921 inches), although these values are not definitive, according to NASA.
How does the wavelength of infrared compared with the wavelength of visible light?
Infrared waves have longer wavelengths than visible light and can pass through dense regions of gas and dust in space with less scattering and absorption. Thus, infrared energy can also reveal objects in the universe that cannot be seen in visible light using optical telescopes.
What emits infrared light?
Since the primary source of infrared radiation is heat or thermal radiation, any object which has a temperature radiates in the infrared. Even objects that we think of as being very cold, such as an ice cube, emit infrared. The warmer the object, the more infrared radiation it emits.
Are infrared waves electromagnetic or transverse?
We know that there are two types of wave – transverse waves and longitudinal waves. Radio waves, microwaves, infrared, visible light, ultraviolet light, X-rays and gamma rays are all transverse waves. They are also all members of the electromagnetic spectrum and some of them can be used for communication.
What part of the electromagnetic spectrum is known as the infrared region?
The electromagnetic spectrum between the wavelengths 0.7 and 1,000 µm is known as the infrared radiation. The lower wavelength limit coincides with the upper limit of visible radiation.
What is the wavelength of red light?
As the full spectrum of visible light travels through a prism, the wavelengths separate into the colors of the rainbow because each color is a different wavelength. Violet has the shortest wavelength, at around 380 nanometers, and red has the longest wavelength, at around 700 nanometers.
How is infrared wavelength measured?
The optical system of an infrared thermometer captures the energy emitted from a circular measuring spot and focuses it onto a detector. A material with a high transmission factor is used for the lenses. The energy captured by the detector is electronically amplified and converted into an electrical signal.
Which of the following represents the wavelength?
Wavelength is usually denoted by the Greek letter lambda (λ); it is equal to the speed (v) of a wave train in a medium divided by its frequency (f): λ = v/f.