Visible Light Spectrum

Most of the spectrum charts that I have seen are listed in wavelengths, particularly nanometers (nm). Where 1 nm = 1x10^-9 m.

Violet, with a wavelenght between 380 and 450 nm, which is near the end of the visible light, next to the ultraviolet region.

Be careful because talk about "colors" is quite dangerous. Firstly, different cultures has different names for the same color. In addition to this, due to the fact that the electromagnetic spectra is continuous (i.e., there are infinite's wavelenghts) it is impossible to say exactly which wavelenght is the limit of the visible region and, consequently, which is the color associate to this wavelenght.

Usually (but it is a convention) it is said that visible region is between 380 and 750 nm.

Mostly neutron stars are detected with radio telescopes. Some can actually be seen with optical telescopes, and these are all optical pulsars.

Neutron stars were discovered because they are radio sources. The first star known to be a neutron star was the Crab Nebula neutron star, or Crab Pulsar, which was discovered to be a neutron star because of its radio emissions in 1965. Its apparent magnitude is 16.5. This puts it beyond the abilities of most amateur telescopes.

Light goes through the lens but not through the mirror.

-- So any imperfection inside the lens can affect the behavior of the light, but an

imperfection inside the mirror can't.

-- So the lens must be made of the finest, purest material through and through,

but the mirror can be made of any material that can hold the shape of one surface ...

metal, granite, etc. The mirror doesn't even have to be glass.

-- Both surfaces of the lens must be accurately curved and polished, and they

must be perfectly parallel to each other. Only one surface of the mirror has to

be optically perfect in shape; the others can be pocked, dimpled, honeycombed,

scratched, drilled, chipped, etc.

-- The lens can only be supported by its edge, and must be rigid enough that no

part of it will bend or deform under its own weight, no matter what position it's

in. The mirror can be supported all around its sides and all over its back. It can

even be fitted with computerized plungers along its back, to push on it and

correct its shape if it sags or bends.

Jupiter does not produce light. It does, however, reflect a lot of the sunlight that reaches it's surface. The amount of light that a planet's surface reflects is call it's albedo, and it's expressed as a value between 0 (nothing reflected) to 1 (100% of light is reflected). Jupiter has an albedo of 0.34, which may seem small compared to Venus's albedo of 0.9, but since Jupiter has a substantially larger surface area than Venus, what it lacks in reflectiveness it makes up for in size.

Atoms are typically smaller in size than the wavelength of visible light, which makes them difficult to detect using visible light. Additionally, atoms do not absorb or reflect visible light in a way that allows them to be seen by the human eye. Special techniques such as electron microscopes are often used to visualize atoms.

Very low temperature molecular clouds emit most of their light in the far-infrared and submillimeter parts of the electromagnetic spectrum. This is due to the low temperatures causing the atoms and molecules in the clouds to emit radiation at longer wavelengths.

This observation indicates that the Sun is rotating about its axis, causing a Doppler shift in the light's frequency. The difference in frequency between points A and B is due to the Doppler effect, showing that different parts of the Sun are rotating at varying speeds.

Have you ever heard of "The Speed of Light" ?

Have you ever wondered why it's just a number, and it doesn't say anything

about the color of the light ?

The speed of all colors of light is the same, as long as they're all moving through

the same substance. It's the number called the "Speed of Light", which you should

be able to look up quite easily.

Visible light can be blocked using materials that absorb or reflect the light, such as tinted glass, opaque materials like metal or wood, or specialized filters like polarizing filters or blackout curtains. These materials prevent the light from passing through, thus blocking it from reaching the desired area.

To do this, it would have to be black, which is the lack of color.

The third primary colour of light besides red and blue is green. This is why colour televisions contain red, blue and green pixels.

Ultraviolet light extends for quite a ways up the electromagnetic spectrum after visible violet ends. Its frequencies are higher. Wavelengths from 400nm to 50nm covering 4 groups of UV.

Proteins are too small to be visible with the naked eye or even with a regular light microscope because their sizes range from a few nanometers to a few micrometers. The wavelength of visible light is much larger than the size of a protein, making it impossible for visible light to resolve individual proteins. Specialized techniques, such as fluorescence microscopy or electron microscopy, are needed to visualize proteins.

The simple answer is 'they do.'

If you were to hold a piece of paper up to direct sunlight, you would be able to the sunlight coming through the paper. The paper is opaque but not completely so, some light does get through. If you were to put a piece of glass on top of this piece of paper you would see it too. Even though glass is transparent to visible light it still has refractive and reflective properties that effect the light that falls on it.

The same is true for x-rays. Flesh and bone is opaque to x-rays but not completely so. Shining x-rays on a limb will show something of the things in it.

It is not meaningful to talk about "amplitude of the visible light spectrum". One might think that more intense light would mean greater amplitude of the light wave, but it just means more photons.

"Visible light" is made up of photons. A single photon has a certain quantifiable energy, and that energy is discussed in terms of frequency or wavelength. A photon with low frequency (towards the red end of the visible light spectrum, for instance) is less energetic than a photon with high frequency (towards the blue end and beyond).

For all intents and purposes, the amplitude of a photon wave-packet could be said to be of "unit amplitude", the amplitude of light.

X-rays have higher energy and shorter wavelengths than visible light rays, allowing them to penetrate deeper into materials and tissues. This property makes X-rays useful for imaging bones and other dense structures in the body. Additionally, the production of X-rays involves high-voltage electricity and specialized equipment, contributing to their higher power compared to visible light rays.

A typical human eye will respond to wavelengths from about 390 to 750 nm. In terms of frequency, this corresponds to a band in the vicinity of 400-790 THz

A blackbody would radiate mostly at visible wavelengths at around 5800 K, corresponding to the temperature of the Sun's surface.

Cosmic rays are high-energy particles originating outside Earth's atmosphere, including protons, electrons, and atomic nuclei. Visible light encompasses the wavelength range of electromagnetic radiation that is visible to the human eye, typically between 400-700 nanometers. Cosmic rays far exceed the energy levels of visible light and are not part of this electromagnetic spectrum.

The longest wavelengths visible to the average human being are in the range of ~700 nanometers which appears to be red to the human eye.

However, I am capable of perceiving the red light that my 2 Logitech cordless laser mice emit at 848 nanometers. I hope I am not damaging my eyesight, but I don't believe the emission spectrum for such a laser would be very wide, so I would bet that 800-820 nm is still in the visible range, at least for younger people. I am 22 years old.

the longest wavelengths of visible are red colored

A continuous spectrum of X-rays is produced when a high-energy electron bombards a target material, causing electrons in the target to be knocked into higher energy levels and then drop back down, emitting X-ray photons across a range of energies. This results in a continuous range of X-ray wavelengths being emitted, rather than discrete lines.

It really depends on the type of glass. "Glass" is a more or less generic name for different substances that look transparent for us. The normal glass is mainly transparent for visible light; it will absorb both most ultraviolet light, and most infrared light.

In the future, advances in technology may allow us to manipulate visible light in more creative ways, such as creating custom light patterns for different purposes or enhancing the efficiency of light-based communication systems. There may also be innovations in materials that can interact with light in new and exciting ways, leading to novel applications in areas like medicine, energy, and computing.