Visible light: The light we can actually see is just a tiny slice in the middle of the spectrum. Typical size: 550 nanometers (the size of a small amoeba). Ultraviolet: This is a kind of blue-ish light just beyond the highest-frequency violet light our eyes can detect. The Sun transm...
vironmental issues: the development of sources of clean energy needs to be【22】line with their interests. Clean energy has been given greater prominence than ever before; it is seen as a new industrial【23】and【24】of economic growth for the new century. The time for clean energy has com...