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For IR, visible, and UV radiation; any shiny surface will do. For acoustic radiation, any massive smooth surface will do. For em radiation, any material with a very different dielectric constant from that of air will do. For ionizing radiation, there is a lot of money to be made from this discovery. That problem is yet (mainly) to be solved.
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Why is much of the sun's radiation reflected back in to space by earth?
Such reflection is called the albedo. For the earth it is 30 - 35%
How is gamma radiation used in medicine?
gamma radiation is used in cancer treatment. the most common source of gamma radiation is.
What does the skin pattern of a garter snake reflect?
the pattern most likely reflect differences in the snakes' habitat.
Does a pet scan use radiation?
Doesn't it make you wonder why these radiation questions have not been answered??
Is sunlight just like radiation?
Yes sunlight is composed of ultraviolet rays which are electromagnetic radiation
