Purification of water for drinking using UV light is a viable way to provide potable wat...

Purification of water for drinking using UV light is a viable way to provide potable water in many areas of the world. Experimentally, the decrease in UV light of wavelength 250 nm follows the empirical relation The normal modes for CO₂ are animated. Each normal mode is associated with a local motion from a list

displayed in the simulation. where l is the distance that the light passed through the water and is an effective absorption coefficient. for pure water and 0.30 cm^-1 for water exiting a wastewater treatment plant. What distance corresponds to a decrease in I of 15% from its incident value for (a) pure water and (b) waste water?