Question

Electric breakdown (sparks) occur in air if the electricfieldreaches 3 × 10⁶N/C. Atthis fieldstrength, free electrons present in the atmosphere arequicklyaccelerated to such large speeds that upon impact withatoms theyknock electrons off of the atom and thereby generate anavalanche ofelectrons. How far must a free electron move under theinfluence ofthe above electric field if it is to attain a kineticenergy of 3 ×10^-19J(which issufficient to produceionization)?

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