Red: yes, green: maybe, blue: definitely not. Blue LEDs only recently became popular because it was the most difficult LED color to manufacture. To me, blue LEDs are so bright in a dark room that I use gaffer's tape to cover them on all of my electronics.
The higher the frequency the more it effects melatonin production. Red is the lowest frequency we can see and has the least effect on sleep. Blue on the other hand is getting a little high in frequency (violet/purple is the highest).
Yes, but generally when people discuss the color of light, they refer to the wavelength, not its frequency.
Im assuming by your user name you are in the medical industry and that is likely true. However in the audio/video industry (which is more relative to this post) frequency is used far more often than wavelength. For instance how often is a speaker's frequency response listed as wavelength response?
Never, since sound and light are measured quite differently. But yes, when we discuss the energy of x-rays, gamma rays, UV, etc., it's by wavelength.Im assuming by your user name you are in the medical industry and that is likely true. However in the audio/video industry (which is more relative to this post) frequency is used far more often than wavelength. For instance how often is a speaker's frequency response listed as wavelength response?
Has anyone ever asked you what wavelength a FM/AM station was on?
Or is that the 2.4GHz or 5GHz wavelength WiFi band? Frequency is used by FAR more than 1% and is probably used 99% of the time in my 2 examples of electromagnetic radiation.Has anyone ever asked you what wavelength a FM/AM station was on?
Light IS electromagnetic radiation. Radio is just at a lower frequency than we can see. Also x-rays, gamma rays and UV (that you quoted) is not visible light either. They are electromagnetic radiation at higher frequency than we can see. Look at my pic in post #10.
Has anyone ever asked you what wavelength a FM/AM station was on?
Wikiapedia said:Visible light is an electromagnetic wave, consisting of oscillating electric and magnetic fields traveling through space. The frequency of the wave determines its color: 4×1014 Hz is red light, 8×1014 Hz is violet light, and between these (in the range 4-8×1014 Hz) are all the other colors of the rainbow. An electromagnetic wave can have a frequency less than 4×1014 Hz, but it will be invisible to the human eye; such waves are called infrared (IR) radiation. At even lower frequency, the wave is called a microwave, and at still lower frequencies it is called a radio wave. Likewise, an electromagnetic wave can have a frequency higher than 8×1014 Hz, but it will be invisible to the human eye; such waves are called ultraviolet (UV) radiation. Even higher-frequency waves are called X-rays, and higher still are gamma rays.
All of these waves, from the lowest-frequency radio waves to the highest-frequency gamma rays, are fundamentally the same, and they are all called electromagnetic radiation. They all travel through a vacuum at the same speed (the speed of light), giving them wavelengths inversely proportional to their frequencies.
where c is the speed of light (c in a vacuum, or less in other media), f is the frequency and λ is the wavelength.
In dispersive media, such as glass, the speed depends somewhat on frequency, so the wavelength is not quite inversely proportional to frequency
