very roughly 350 to 750 nanometers
Visible light. The higher the frequency, the shorter the wavelength.
black
Neither the amplitude nor the speed does.
Less than that of visible light, which is in the range of about 350-700 nm - so UV rays would have a wavelength below 350 nm.
The frequency range of visible light.
The longest visible wavelength is that of the last color you can see on thered end of the rainbow. It's not exactly the same for every individual's eyes.
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.
The visible spectrum is the portion of the electromagnetic spectrum that is visible to (can be detected by) the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light.
visible spectrum
Red color in the visible spectrum has longest wavelength.
the range of the spectrum that's known as "visible light"
Wavelengths in the range of 0.4 - 0.7 microns are visible.