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Inside an ionization chamber there are two planar electrodes of 300cm^(2) area, 2 cm apart. The chamber is filled with air under normal conditions. At a voltage of 200 V the current is equal to 1.8muA which is far below the saturation value. Find the ion concentration and the ionization coefficient of air. The mobilities of the ions are: b_(+)=1.37xx10^(-4)m^(2)//(V.s),b_(-)=1.89xx10^(-4)m^(2)//(V.s). |
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Answer» `n=(id)/(eUS(b_(+)+b_(-)))` The concentration of air MOLECULES in normal CONDITIONS is equal to the Loschmidt numberwhich gives the ionization coefficient `alpha=n//N_(L)`. |
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