Complete the following questions as clearly as possible. List the major regions
ID: 108541 • Letter: C
Question
Complete the following questions as clearly as possible. List the major regions of the EM spectrum from shortest wavelength to longest wavelength. For the visible part of the spectrum, list the shortest and longest wavelengths of visible light. For each region you list, also name something that produces that wavelength. If an electromagnetic wave has a frequency of 200 Megahertz (MHz). what is its wavelength? Recall that all electromagnetic waves move at the speed of light. Explain in two or three sentences how we can know what an object is made out of by looking at the light it gives off? When you are finished, submit this assignment in the same way previous assignments have been submitted.Explanation / Answer
1. There is no major regions of the EM spectrum from shortest to longest wavelength.
From shortest to longest wavelength, is called visible spectrum of light.
For visible spectrum of light-
Wavelength of White Light : The white light extends from the 400 nm to 750 nm. The white colour when passed through the prism it gets diffracted into all the other colours.
Wavelength of Ultraviolet Light : Ultraviolet light belongs to electromagnetic spectrum and it extends from end of visible region and x-rays. Ultraviolet light is in the range of 10 nm to 400 nm with energies from 3eV to 124 eV. Ultraviolet light gets its name because it is the light closest to the violet portion of visible light.
Wavelength of Red Light : The red light of the visible spectrum has a wavelength of about 650 nm. The best place to see natural red colour is at sunrise and sunset when red or orange colours are present. This is because at the sunrise and sunset the wavelengths associated with red and orange colours are not properly scattered by the atmosphere than the wavelength of other colours (like blue and purple).
Wavelength of Yellow Light : The yellow light has a wavelength of about 570 nm. Low-pressure sodium lamps, like those used in parking lots, emit a yellow (wavelength 589 nm) light.
Wavelength of Green Light : The green light has a wavelength of about 510 nm. Grass appears green because all of the colours in the visible part of the spectrum are absorbed by the grass except green. The grass reflects green wavelength, therefore the grass appears green.
Wavelength of Blue Light : The blue light which we see has a wavelength of about 475 nm. The atmosphere scatter shorter wavelength efficiently and hence the wavelength associated with blue colour is scattered more efficiently by the atmosphere. This is the reason why we see sky to be blue.
Wavelength of Violet Light : The violet light has a wavelength of about 400 nm. As already discussed the violet and blue which belongs to short wavelength region are more efficiently scattered than other wavelengths. Our eyes are more sensitive to the blue colour and hence we see sky blue and not violet.
Wavelength of Indigo Light : The indigo lies between the blue color and the violet color and hence the wavelength of indigo lies between 420 nm to 450 nm.
Wavelength of Infrared Light : Infrared (IR) radiation belongs to electromagnetic radiation spectrum. Infrared has a longer wavelength than visible light. Infrared is close to red colour in visible spectrum and hence it is sort of "redder-than-red" light or "beyond red" light, that is why the name infrared. Infrared radiation cannot be seen but can only be feel as a heat. The best example of feeling the infrared by yourself is feeling the heat after the burner is turned off.