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why does plants color change to black when absorbed all wavelengths
6000 Kelvin
To do this, it would have to be black, which is the lack of color.
Radio telescopes and infra-red telescopes operate at longer wavelengths/lower frequencies than visible light. Also, ultraviolet telescopes operate at shorter wavelengths/higher frequencies than visible light.
No black paper is not translucent ts opaque
I would call this just "the visible spectrum." http://en.wikipedia.org/wiki/Visible_spectrum
Barium produces emission lines at at least 21 different wavelengths in the visible range, including at least one each in red, orange, yellow, green, blue, indigo, violet.
The colour of an object is determined by the wavelengths of light it reflects. An object that is purley one wavelength (lets say a specific wavelength in the blue part of the spectrum) would be absorbing all visable wavelengths except that specific blue wavelength.
Gamma rays. If you mean visible light, that would be the blue light.
Violet is actually the shortest wavelength, as you consider the color spectrum. After blue comes indigo, then violet. So blue is the third shortest. The color spectrum ranges from red to violet, with red being the longest. Naturally, violet would then be the shortest. Of course this goes for human visible wavelengths. Ultraviolet light is shorter in wavelength, but not human visible. Xrays have even shorter wavelengths, but they also are not human visible. Gamma rays are the shortest of all, but again not human visible.
We would call any wave longer than 1 millimeter a "radio wave".
An "optical" telescope would naturally collect light from optical wavelengths, meaning visible light from ~400-800nm.