Sparks - when it collides with the atom. atomic radius ~...

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Qsparks.1 What factors should influence the MEAN FREE PATH of a particle in air? A) air density B) size of an air molecule C) particle speed 1) A only 2) B only 3) C only 4) A & B 5) A, B, & C
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Qsparks.2 Calculate approximately the mean free path of an electron in air. 1) 4e-28 m 2) 7e-20 m 3) 5e-7 m 4) 2e6 m
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Qsparks.3 How is charge transferred from one charged sphere to another in a spark? 1) electrons jump across the gap 2) protons jump across the gap 3) electrons and positive ions drift in ionized air
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Qsparks.4 Estimate the magnitude of the electric field required to pull an electron out of an atom. atomic radius ~ 1e-10 m 1) 2.3e-18 N/C 2) 2.3e-8 N/C 3) 14.4 N/C 4) 3e6 N/C 5) 1.4e11 N/C
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Qsparks.5 Calculate the minimum kinetic energy a particle must have to be able to knock an electron out of an atom
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Unformatted text preview: when it collides with the atom. atomic radius ~ 1e-10 m 1) 2.3e-18 J 2) 2.3e-8 J 3) 14.4 J 4) 3e6 J 5) 1.4e11 J Qsparks.6 Electron starts from rest. Its final kinetic energy is 2.3e-18 J. What is the potential difference | V| through which it was accelerated? 1) 3.7e-37 V 2) 1.6e-19 V 3) 2.3e-18 V 4) 7.0e-2 V 5) 14 V Qsparks.7 Electron travels one "mean free path" (~5.3e-7m) through a potential difference of 14 V. What is the electric field in the region? 1) 7.4e-6 V/m 2) 2.6e7 V/m 3) 1.2e-24 V/m 4) 4.2e-12 V/m 5) 3e6 V/m Qsparks.8 Testing the model: Mean Free Path is inversely proportional to air density. If air density is INCREASED, will this change the E needed for a spark? 1) E critical should increase 2) E critical l should decrease 3) E critical should stay the same...
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Sparks - when it collides with the atom. atomic radius ~...

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