That's hard to discuss, because the electromagnetic spectrum has no ends.
If you name a frequency, then no matter how low it is, I can name a lower one,
and no matter how high it is, I can name a higher one. So, it's easy to describe
the size of the visible portion, but it's hard to describe the size of the full EM spectrum.
So let's just talk about the size of the part of the E&M spectrum that humans
use for radio communication, and ignore all the rest of it ... the infra-red, x-rays,
ultraviolet, gamma rays, all that other stuff. Only the part that we know how to
generate and modulate with very precise frequency control, and transmit and
receive over significant distances.
That's the portion of the E&M spectrum with frequencies from about 60 KHz
to about 100 GHz (wavelengths from about 3 millimeters to 5 kilometers).
'Linearly', that's a range of about 100 GHz bottom-to-top. But a much better
way to talk about parts of the E&M spectrum is logarithmically ... how many
'octaves' (doublings) or 'decades' (multiplied by 10) they cover.
Measured that way, our use of radio spans about 21 octaves, or about 6.2 decades.
Now we're ready to go look up the frequency/wavelength range of visible light.
A typical human eye will respond to wavelengths from about 390 to 750 nm
(3.9 to 7.5 x 10-4 millimeters). In terms of frequency, this corresponds to a band
in the vicinity of 400-770 THz (400,000 to 770,000 GHz).
That makes the visible range about 0.95 octave, or about 0.28 decade ... only
about 41/2% as wide as the range of wavelengths we use for radio communication!
Now, for fun, we'll try and include those other E&M phenomena that we've been ignoring.
We'll still have to decide where the ends of the spectrum are, because it really doesn't
have any.
For the bottom frequency, let's take 60 Hz. That's the small amount of RF that
radiates from power lines, which we always ignore. The wavelength is about
5,000 kilometers. (!)
Let's take gamma radiation for the top end ... the stuff generated in nuclear
decay, supernovas, black holes, that sort of thing. Dangerous stuff because
of its high energy. We're still here only because Earth's atmosphere absorbs
most of the gamma radiation from space, and not much of it ever reaches the
ground. Astronauts have to be shielded from it.
Gamma rays typically have frequencies above 10 exahertz (or >1019 Hz), and
wavelength less than 10 picometers (less than the diameter of an atom.)
So now, our 'expanded' range of electromagnetic spectrum covers 57.2 octaves,
or 17.2 decades, and the range of visible light is about 1.6% as wide as that.
Bottom line . . . we don't actually "see" a whole lot of the E&M spectrum, but
we know how to build instruments that detect the parts we can't see.
In the band roughly between 400 - 800 Thz.
(400,000 - 800,000 GHz)
(400,000,000 - 800,000,000 MHz)
(400,000,000,000 - 800,000,000,000 KHz)
(400,000,000,000,000 - 800,000,000,000,000 Hz)
-- at higher frequencies (shorter wavelengths) than radio, microwave,
and infrared radiation,
-- at lower frequencies (longer wavelengths) than ultraviolet radiation,
X-rays, and gamma rays.
. . . . . radio ... microwave ... infrared ... VISIBLE ... ultraviolet ... X-rays . . . . .
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1) Light is a type of electromagnetic radiation2) It has a specific range (a rather narrow one) of frequencies
Right between infrared and ultraviolet.
Primarily Yellow but really it uses most of the visible spectrum, just some parts more than others. Green plants actually have five type of pigments that serve in photosynthesis. When the leave of the deciduous trees turn in autumn you can see the colours of many of these as they are selectively withdrawn.
Depending on the intensity of the light the thermometer should indicate an increase in temperature.
We know that gamma rays are electromagnetic energy, and they'll occupy a place on the electromagnetic (EM) spectrum. You can locate gamma rays right at the top end of the EM spectrum because their frequencies are so high (or their wavelengths are so short, if you prefer).
No. It is not possible to see the Sun, Moon, or any stars. For that matter, other people are likewise invisible to you if there is any air between you and them. Another answer: The question describes the type of light of interest as "visible" light. By definition, then, it must be referring to light that can propagate from place to place without appreciable attenuation, and be detected by the eye. This process, defined by the question itself, requires that the atmosphere be transparent, not opaque. For if the light could not penetrate earth atmosphere, then it must follow as the night the day, that that selfsame light is ... ipso facto, prima facie, fragrant dilecto, pro bono and choclo molto ... NOT what one could in anywise refer to as the "visible" kind.
Many firework colors are made by burning metal salts. Each element gives off a unique color of the spectrum. When fireworks are lit, it causes the atoms of the metal salts to become excited, and as the fireworks are shot into the air electronic transition takkes place and visible light is seen. Depending on what elements the firework is made of will determine the color seen.
The visible spectrum is a tiny, almost negligible slice of the electromagnetic spectrum. 'Sonar' has no place in this discussion. It's not even electromagnetic.
Microwaves would be found below infrared radiation, which is below visible light. They'd be at the top of what is called the radio spectrum.
Primarily Yellow but really it uses most of the visible spectrum, just some parts more than others. Green plants actually have five type of pigments that serve in photosynthesis. When the leave of the deciduous trees turn in autumn you can see the colours of many of these as they are selectively withdrawn.
white light is not a single color..it is made up of 7 different colors which include red and blue and yes it is there in the electromagnetic spectrum between ultraviolet and infrared radiation
Sound waves and electromagnetic waves are different. Sound is composed of density waves in the air or some other form of matter. Sound is a mechanical compression-rarefaction wave. The different types of electromagnetic waves are gamma rays, X-rays, ultraviolet rays, visible light, infrared radiation, microwaves, and radio waves.
It all depends upon where you place the boundaries of the infrared spectrum. The electromagnetic spectrum is a continuum and there is no exact boundary for any particular designation. If you define IR as that radiation below red which is invisible then Yes it is invisible.
Depending on the intensity of the light the thermometer should indicate an increase in temperature.
We know that gamma rays are electromagnetic energy, and they'll occupy a place on the electromagnetic (EM) spectrum. You can locate gamma rays right at the top end of the EM spectrum because their frequencies are so high (or their wavelengths are so short, if you prefer).
The same energy that lets you see in the first place: light.
No. It is not possible to see the Sun, Moon, or any stars. For that matter, other people are likewise invisible to you if there is any air between you and them. Another answer: The question describes the type of light of interest as "visible" light. By definition, then, it must be referring to light that can propagate from place to place without appreciable attenuation, and be detected by the eye. This process, defined by the question itself, requires that the atmosphere be transparent, not opaque. For if the light could not penetrate earth atmosphere, then it must follow as the night the day, that that selfsame light is ... ipso facto, prima facie, fragrant dilecto, pro bono and choclo molto ... NOT what one could in anywise refer to as the "visible" kind.
All forms of electromagnetic radiation move from place to place at the speed of light.
The Ramanathan scattering of light is the phenomen of visible light scaterring into the 7 different invisible colours of light, when it comes in contact with water, the water sufficing as a glass spectrum to diffract the light into the colours. This phenomenon takes place naturally after rain as the rainbow appears.