# Photon and visible portion

This was actually the subject one of the most important arguments in physics.

Color and Light Here we ask how color is sensed by the viewer. To answer the question we need to specify how color is described and how color information is received by the eye.

The starting point of an understanding of color is a description of light. Photons and Waves Isaac Newton discovered in that light could be split into many colors by a prism, and used this experimental concept to analyze light.

The colors produced by light passing through a prism are arranged in a precise array or spectrum from red through orange, yellow, green, blue, indigo and into violet.

## Background

The students' memory trick is to recall the name "Roy G. Biv" where each letter represents a color. The order of colors is constant, and each color has a unique signature identifying its location in the spectrum.

The signature of color is the wavelength of light. The electromagnetic spectrum, which encompasses the visible region of light, extends from gamma rays with wave lengths of one hundredth of a nanometer to radio waves with wave lengths of one meter or greater. Somewhat less than years after Newton's discoveries, James Clerk Maxwell showed that light was a form of electromagnetic radiation.

This radiation contains radio waves, visible light and X-rays. Figure 1 shows electromagnetic radiation as a spectrum of radiation extending beyond the visible radiation to include at one end radio waves and at the other end gamma rays. The visible light region occupies a very small portion of the electromagnetic spectrum.

The light emitted by the sun falls within the visible region and extends beyond the red into the infrared, IR and the ultraviolet UV with a maximum intensity in the yellow. When we consider light as an electromagnetic wave, a color's spectral signature may be identified by noting its wavelength.

We sense the waves as color, violet being the shortest wavelength and red the longest. Visible light is the range of wavelengths within the electromagnetic spectrum that the eye responds to.

Although radiation of longer or shorter wavelengths are present, the human eye is not capable of responding to it. A wave representation of three different light hues: Three typical waves of visible light are shown in Fig. Violet light is electromagnetic radiation with wavelengths of nanometers and red light has a wavelength of nanometers.

The nanometer is a unit of distance in the metric scale and is abbreviated as nm. The wavelengths of visible light are smaller than common objects such as the thickness of a sheet of paper or the diameter of a human hair.

Both of these are about one hundred microns thick which translates to distances greater than one hundred wavelengths of visible light. As we move through the visible spectrum of violet, blue, green, yellow, orange and red, the wavelengths become longer.

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The range of wavelengths - nm of visible light is centrally located in the electromagnetic spectrum Fig.The photon is the fundamental particle of visible light. In some ways, visible light behaves like a wave phenomenon, but in other respects it acts like a stream of high-speed, submicroscopic particles.

The term photon (meaning "visible-light particle") was coined for these energy packets.

## What Electro-Magnetic Waves Are Absorbed By A Solar Cell?

Particle-like behavior is not restricted to the visible-light portion of the electromagnetic radiation spectrum, however. Photon and Visible Portion.

Topics: Photon, Atom, Electromagnetic The emission spectrum of an unknown element contains two lines-one in the visible portion of spectrum and the other, ultraviolet. Based on Figure and on what you have learned about Niels Bohr’s model of atom, account for the difference in energy between these lines.

The photon is the fundamental particle of visible light.

In some ways, visible light behaves like a wave phenomenon, but in other respects it acts like a stream of high-speed, submicroscopic particles. A photon energy of 2eV lies in Selected Answer: the visible portion of the spectrum Correct Answer: the visible portion of the spectrum Question 6 1 of 1 points Violet light has an energy close to eV with a wavelength of Selected Answer: nanometers Correct Answer: nanometers Question 7 1 of 1 points The creation and destruction of.

## Single Photon Emission Computed Tomography (SPECT) - Medical Clinical Policy Bulletins | Aetna

Photons are basically the most visible portion of the electromagnetic spectrum. of relativity. without the photon we would not understand the importance of the speed of light and with it the.

Electromagnetic spectrum - Wikipedia