Visible light
The color of the wavelength lambda = 685 nanometers is "deep red". The wavelength lambda = 685 nanometers equals the frequency f = 503,852,870,588,235 Hz. 1 nanometer = 1×10−9 meter. 685 nm = 0.000000685 meters. Scroll down to related links and look at "Radio and light waves in a vacuum".
There is no longest wave-length for light. It can be infinitely long (just as light waves could be infinitely short). The longest visible light that humans can see is about 750 nanometers long, which is 0.00075 of a millimeter. This color would be a shade of red. Some other animals and insects can see slightly longer wavelengths, and many can not even see what we can.
Visible 'light' ranges from roughly 380 to 750 nanometers (billionths of a meter). It can vary somewhat for different individuals' eyes. If electromagnetic radiation has a wavelength longer than about 750nm or shorter than about 380nm, you may still call it 'light' if you want, but the human eye doesn't respond to it.
Electromagnetic radiation having a wavelengths between 380 - 750nm is visible to the normal human eye. This region of the spectrum is called visible light. Radiation of any other wavelength cannot be seen with the naked eye
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electromagnetic radiation with wavelengths ranging from about 380 nanometers to about 750 nanometers (a.k.a. visible light)
. . . wavelengths between roughly 380 and 750 nanometers.
Higher frequency than infrared, but lower than ultraviolet, in otherwords in the middle
Visible light wavelengths range from approximately 400 to 700 nanometers. This corresponds to violet light at the shortest wavelengths and red light at the longest wavelengths in the visible spectrum.
Red light has a longer wavelength than violet light. Red light has wavelengths around 620-750 nanometers, while violet light has wavelengths around 380-450 nanometers.
Roughly, the spectrum wavelengths are the speed of light divided by the frequency, c/f; 300M/400T=.75 micrometers for Red and 300M/800T=.375 micrometers for Violet..These wavelengths are expressed usually as 750 nanometers and 375 Nanometers.
The human eye can perceive light wavelengths ranging from approximately 380 nanometers (nm) to about 750 nm. This range encompasses the visible spectrum, which includes colors from violet (shorter wavelengths) to red (longer wavelengths). Beyond this range, ultraviolet light (below 380 nm) and infrared light (above 750 nm) are not visible to the human eye.
roughly in the range of 380 - 750 nanometers
False. Visible light with the shortest wavelengths corresponds to violet and blue light, not red and orange. The visible spectrum ranges from approximately 380 nanometers (violet) to about 750 nanometers (red), with red light having the longest wavelengths.
The wavelength of red light is typically between 620 to 750 nanometers. wavelengths.
As stated earlier: Violet light: 380-450 nm Red light: 620-750 nm nm=nanometer=10-9 meter
The frequency range for visible light is 400-790 THz