Electromagnetic Spectrum

white and wonder “Where’s the blue?” unless a greater being put the idea of “blue” in

When observed, the water was a blue-green all the way through. This is because the seal was more than likely not tight enough around the test tube, letting oxygen into the tube, which caused the color to change.

When a beam of sunlight passes through a specially shaped glass object called a prism, the rays of different wavelengths are bent at different angles. The bending breaks up the sunlight into a beautiful band of colors. This band contains all the colors of the rainbow and is called the visible spectrum. At one end of the spectrum, the light appears as violet. It consists of the shortest wavelengths of light that we can see. Farther along the spectrum, the light has increasingly longer wavelengths. It appears as blue, green, yellow, orange, and red, each shading into its neighboring colors in the spectrum. The longest wavelengths of light that we can see appear deep red in color. Some descriptions of the spectrum also mention the color indigo, which is closely related to blue, between violet and blue.

Furthermore, X-ray of higher energy than required for imaging is used for radiation therapy. The radiation therapy makes use of ionization radiation (and no images) for the treatment of diseases, such as

- Even though the X-ray expose patient to harmful radiation it is used to see inside the human body and diagnose broken bones, gallstones and later tuberculosis.

1. Ordinary X-Rays can show a wide variety of things such as bones, teeth, bone fractures, and other abnormalities of bones and other things in the body.

can be seen in the rocks, trees, sky, and mountains. The colors that are present in the

17. Why does the Moon change its phase, how does it move, and how do these combine to create eclipses?

2- It is impossible to identify all element with the naked eye because they don’t release enough energy, therefore the color is not as visible. Besides, not all elements give a light that it is in the visible part of the spectrum, so we need to use a prism.

X-rays are used to guide tubes or cameras through the body. It is used to look at the heart, lungs, and chest walls. They can also be used to rule out any other conditions that might be causing the weaknesses.

The light that the Sun provides, also helps to light up different objects in the night sky, even if their billions of miles away.

The biological processes of colour perception which happen in the brain are innate and contribute towards the way in which individuals view colour. Cones and rods work together in order to create the colour that is perceived. The psychological processes are related to the way each individual person perceives colour, and thus may be different to the next. Colour perception is different for everyone, something that is light blue to one person, may be light green to another person. Both the biological and psychological processes work together. A range of processes will be discussed throughout this essay and will demonstrate differences in the

Figure 1’s “human eye response” is a magnified portion of the electromagnetic spectrum and represents the sensitivity of the average human eye to electromagnetic radiation. As this graph shows, the human eye is most sensitive to light in the middle part of the visible spectrum: green and yellow. This is why emergency vehicles are often painted garish yellows or green — they stand out in all weather, including fog, and at night better than the “old-fashioned” fire-truck red. The eye is much less sensitive toward the red and purple ends of visible light. The infrared and ultraviolet portions of the spectrum are invisible to humans.

Since color is only perceived by the eyes and interpreted by the brain, the question of the existence of color arises. If not for the ability of receptors receiving reflected light, then how else does color exist? Furthermore, if everyone in the world was blind, then would blue still be blue? If the blue is still significant even without proper perception, then there must be some quality

Natural and artificial light have varying properties that affects their capability and appropriateness these properties regularly impact their surroundings. Natural light comes in a spectrum of colours, which are the visible rays. Also on the colour spectrum are shorter wavelengths, named ultraviolet rays and higher wavelengths, known as infrared rays. Both of these are not visible to us. Exposure to the sunlight can help