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Ultraviolet would be the part of the spectrum shorter than visible.
ultraviolet light.
The term "electromagnetic" is the wrong term. The correct term is "photoelectric". Aslo the phrase between the infrared and ultraviolet should be stated: between the thresholds of infrared and ultra-violet light. So the correct question would be: What is the region of the photoelectric spectrum that lies between the thresholds of infrared and ultra-violet light? Answer: The visible light spectrum
If you're listing them in the order of increasing frequency, then infrared comes just before visible. If you're listing them in the order of increasing wavelength, then ultraviolet comes just before visible. If you're monitoring the energy spectrum from a distant galaxy, then nothing comes before visible, because all electromagnetic waves travel through space at the same speed.
Ultraviolet light is not visible. Many ultraviolet lamps also emit some visible light along with the ultraviolet, typically visible violet. Also, ultraviolet light is an ionizing radiation, and will cause some flourescent materials to emit various visible wavelengths of light.
If human vision could detect ultraviolet light as well as the visible spectrum, ultraviolet light would appear to be just another color. Of course, because we can't see ultraviolet, and can only see three basic colors, the idea of a new color is impossible to completely grasp, since all the colors we see are based off of three primary colors. The addition of ultraviolet light to the spectrum of visible light would allow us to see more things, and some things that appear transparent would appear translucent or opaque, and make things we can already see appear more colorful.
In visible light, that would be blue light. But please note that there are also higher frequencies, not visible for the naked eye - ultraviolet, x-rays, gamma rays.
The Energy of the light would increase from visible light into the ultraviolet range-APEX
It is actually true that the shorter wavelength of UV would give you finer resolution - although for most purposes, visible light works perfectly well.
UV rays can penetrate the cell membrane
Yes. All wavelengths of electromagnetic radiation travel at the same speed, at least through vacuum. There are some slight wavelength-dependent differences in some material media, but nothing substantial that you would notice.
That would be a lunar eclipse.