(Solved): 2. Plasma oscillation Compute the plasma frequency for the following cases: (a) Vacuum arc with ele ...

2. Plasma oscillation Compute the plasma frequency for the following cases: (a) Vacuum arc with electron density of about \( 10^{21} \mathrm{~m}^{-3} \); (b) Hall thruster with electron density of about \( 10^{17} \mathrm{~m}^{-3} \); (c) Cold atmospheric plasma with electron density of about \( 10^{18} \mathrm{~m}^{-3} \).