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Answer #1

electron-air molecule collision is about 10-15 cm2

the fraction of the particles scattered is Rs / Ri

for air A = 29

Rs / Ri = NA L / A X 10-3

Rs / Ri = 1 - 90%

= 0.1

0.1 = NA L / A X 10-3  

0.1 = 6.023 X 1023 X 0.2 X X 10-19 / 29 X 10-3  

= 0.1 X 29 X 10-3 / 6.023 X 1023 X 0.2 X 10-19  

= 2.407438 X 10-7 kg/m3

or

= 2.407438 X 10-10 g/cm3  

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