Visible Light Spectrum

Every color that you have ever perceived with your own eyes or heard mentioned

or described by others, every hue of paint ever mixed, every glowing shade ever

to appear on a TV screen or computer monitor, and every shade of fabric ever woven

is in the visible spectrum, including thousands that have never been named because

they so closely resemble others that have been.

They range from deep red on one end, to bright violet on the other end, and on the way

they pass through Orange, Yellow, Green, Blue, and Indigo ... just to name a few universally

understood signposts.

No, astronomers also use other forms of electromagnetic radiation like radio waves, infrared, ultraviolet, X-rays, and gamma rays to observe objects in outer space. Each type of radiation provides unique information about the universe and helps astronomers to study different aspects of celestial objects.

Light reflects because as the electromagnetic wavefront hits the material the electrons within the material start to vibrate(A charged particle in an electric field better vibrate...no?) and an accelerating charged particle gives off EM radiation by nature in all directions (Technically more light in certain directions than others, but close enough) and these new EM waves are the ones you see.

(verification needed, but at least its better then the old answer of "its shiny")

Visible light rays from the Sun penetrate the atmosphere and heat the Earth's surface. The Earth absorbs this energy and then emits it back as infrared radiation, which is absorbed by greenhouse gases in the atmosphere. This process, known as the greenhouse effect, warms the atmosphere and helps regulate Earth's temperature.

No, concrete does not absorb visible light and re-radiate it as infrared energy. Concrete reflects and scatters visible light, and it absorbs some of the heat energy from sunlight. This absorbed heat can then be released over time as infrared radiation when the concrete cools down.

Alpha rays are not one of the waves of the electromagnetic spectrum. Alpha rays are actually streams of alpha particles, which are clusters of two protons and two neutrons emitted by certain types of radioactive materials.

The velocity of visible light waves is the same as the velocity of radio waves in a vacuum, both traveling at the speed of light (approximately 299,792 kilometers per second).

The energy of visible light ranges from approximately 1.65 to 3.10 electronvolts (eV), corresponding to wavelengths of 400 to 700 nanometers. This energy range allows visible light to interact with matter in various ways, such as causing electronic transitions or generating heat.

Comets are visible because they reflect sunlight. As a comet travels closer to the Sun, the sunlight heats up the comet's surface, causing it to release gas and dust that form a glowing coma and tail. This reflected sunlight is what makes comets visible from Earth.

The frequency of 560 nm light is approximately 536 THz (terahertz). This calculation is based on the relationship between frequency (f), speed of light (c), and wavelength (λ), which is given by the equation f = c / λ. In this case, c is the speed of light in a vacuum, which is about 3.00 x 10^8 m/s.

Combining all colors of the visible spectrum results in white light. White light is a combination of all the colors in the visible spectrum and is perceived when all colors are present in equal intensity.

Sunlight is broken down into three major components: (1) visible light, with wavelengths between 0.4 and 0.8 micrometre, (2) ultraviolet light, with wavelengths shorter than 0.4 micrometre, and (3) infrared radiation, with wavelengths longer than 0.8 micrometre. The visible portion constitutes nearly half of the total radiation received at the surface of the Earth.

Visible light waves can be separated into different wavelengths of colored light. This can be achieved using a prism, diffraction grating, or other optical devices that disperse light based on its wavelength, resulting in the familiar rainbow spectrum.

If you mean "Why are lightbulbs not hazardus BECAUSE of radiation", then i can answer that:

Light bulbs don't contain a lot of harmful rays, it emits just enough radiation. If it were a lot more, then it could be very dangerous.

Hope it helps

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++=

It would help even more if you'd not confused the issue so much! Ordinary lamps radiate light and heat ONLY. The heat may present a hazard by location and surroundings, but that's the fault of the user. The bulb itself is intrinsically very safe.

It is split/dispersed further for exactly the same reasons as one prism splits white light.

Isaac Newton's classic experiment conducted during the plague year of 1665 in England was arranged as follows

He closed the wooden shutters in a room during a sunny day and made a hole in the shutters to allow a shaft of sunlight to enter the darkened room. On a pedestal in the centre of the room he arranged a glass prism to refract the white sunlight into a spectrum of colours which were displayed on the whitewashed wall. He then blocked all the other colours except red light emitted from the first prism by using a sheet of wood. The red light from the first prism was then directed towards a second glass prism to see if more colours or white light would be generated. He found that the red light was further refracted and no other colours were produced. He thus determined that sunlight was composed of the 7 colours of the spectrum. It is not at all easy to take a spectrum and recombine it through a prism to make white light. It can be done by mixing red,blue,and green light from separate pure light sources of these colours. This is how colour television works and is called additive mixing .This is different to mixing paint pigments together, this is called subtractive mixing.

no

You might say that, even though nobody else ever does.

A change in the frequency of sound is perceived as a different 'pitch'.

A change in the frequency of light is perceived as a different 'color'.

In each case, even a small change in frequency is easily perceptible to the

human sensory system. Who cares what word you use to describe it !

Sound waves are not detected by telescopes, as telescopes are instruments that are designed to detect electromagnetic radiation, such as radio waves, X rays, and visible light. Sound waves require a medium, such as air or water, to travel through, and can't propagate through the vacuum of space where telescopes operate.

Antennas with longer wavelengths have higher gain, which allows them to capture more of the incoming signal and provide better performance. Longer wavelengths also allow for better penetration through obstacles like buildings and trees, resulting in more reliable signal reception. Overall, longer wavelength antennas are better suited for long-distance communication and wider coverage areas compared to shorter ones.

Violet light has the shortest wavelength of all visible light.

Let's examine what it means when a bulb is 100W rather than 60W.

I'm assuming that you meant to state that they are 120V bulbs being connected to a 240V circuit1.

With the same voltage on each, and because power is voltage times current, the current must be greater in a 100W bulb than in a 60W bulb.

Since a incandescent bulb is a linear load, if you double the voltage then you double the current2. So the current through the 100W bulb is still greater than through the 60W bulb.

Or you may analyze it a bit more. With both on 120V, for more current to flow in the 100W bulb, the resistance of it must be less than that of the 60W bulb. So you may generalize that under any voltage (same voltage applied to each), the 100W bulb will always have more current through it than the 60W bulb.

1Actually, if they are 120V bulbs in a 240V circuit, there is a high probability that they will blow out. But before they do, this is what will happen.

2Well, slightly less than double, because the temperature coefficient on the filament is positive, so the hotter it is, the greater the resistance. Although this may seem nonlinear, a light bulb or other temperature sensitive resistive element is still defined as linear if over the short term it obeys Ohms law at any instant of the waveform.

The current in the 100 watt bulb will be greater. Power is current times voltage, so current is power divided by voltage. Voltage is the same is both cases of this question, so current is proportional to power at 240V.

From the items on that list, infrared light has the lowest frequency,

and X-rays have the highest.

Any efficient one can. The inefficient ones are those that turn most of

their fuel or electricity into heat, and only a small part of it into light.

A few efficient light sources are:

-- CFL bulbs

-- fluorescent minerals

-- fluorescent light tubes

-- the hind end of fireflies